# 2021 수학의 바이블 연산 중2-1 답지 정답

(1)

## 1

(2)

유리수의 소수 표현 p. 09~15

ㄷ, ㅁ

ㄴ, ㄷ, ㅁ, ㅅ

ㄱ, ㄹ, ㅂ, ㅇ

×

0.3, 유

0.1666y, 무

-0.625, 유

0.285714y, 무

;1£0;

-;5\$;

;2&;

;10&0;

-;4#;

;2#0&;

;2ª0»0;

;1¤2¢5;

2, 6, 0.6

5, 5, 25, 2.5

### 27

52, 52, 25, 2, 25, 0.25

### 28

5, 5, 35, 2, 35, 0.35

### 29

52, 52, 75, 3, 75, 0.075

### 30

2, 2, 2, 2, 2, 2, 2, 0.02

### 31

2, 5, 2, 5, 5, 2, 5, 0.05

### 32

2, 22, 2, 22, 16, 2, 16, 0.16

### 33

125, 3, 23, 3, 23, 96, 3, 96, 0.096

0.75

0.14

0.064

0.075

×

×

×

×

3, 0.H3

65, 2.H6H5

28, 1.0H2H8

876, 3.1H87H6

×

×

×

0.H5

0.1H6

2.8H3

0.58H3

0.H2H7

0.H37H0

9

2

2

0

0.H6H3

3

5, 있다

2, 7, 없다

;2ª5;, 25Û`, 있다

### 80

;3¢3;, 43_11 , 없다

3

9

11

21

3

9

ㄴ, ㄷ, ㄹ

②, ③

### 94

①, ③ 순환소수의 분수 표현 p. 17~23

### 95

10, 10, 10, 9, 5, ;9%;

### 96

100, 100, 100, 99, 31, ;9#9!;

### 97

1000, 1000, 1000, 999, 1216, :Á9ª9Á9¤:

;9*;

;3!3(;

:Á9¤:

:ª9¥9»:

;3!3!3%;

### 103

10, 10, 1000, 1000, 1000, 10, 990, 43, ;9¢9£0;

### 104

10, 10, 100, 100, 100, 10, 90, 90, ;1@8#;

### 105

100, 100, 1000, 1000, 1000, 100, 900, 900, ;2£2¥5;

;9&0#;

;1@5#;

;4£9Á5;

;1\$6*5!;

;2^2(5\$;

9, 1

99, 2

999, 111, 3

;3!;

;9\$9!;

;3!3&3@;

5, 9, :Á3¤:, 1

### 124

2, 99, :ª9¼9£:, 2

### 125

1942, 1, 999, ;3^3\$3&;, 3

:£9ª:

;3%3(;

:£3¼7¥:

### 129

3, 90, ;9@0(;, 1, 1

### 130

14, 900, ;4¤5¦0;, 1, 2

;9&0&;

;1¦8¦0;

;9%9!0!;

;4!9)5@0&;

### 135

104, 10, 90, ;4\$5&;, 1, 1

### 136

2148, 21, 990, ;3&3)0(;, 2, 1

;1\$8&;

;1!6^5&;

:ª3ª0°0Á:

;1*9!8!0(;

>

<

>

<

<

>

:Á9¼:

:ª3ª:

:Á9¼:

;3*;

;3!3);

:ª9¤9¤:

×

×

(3)

×

×

×

×

×

92

### 170

ㄴ, ㄹ, ㅁ 지수의 합과 곱 p. 25~29

3ß`

5à`

aß`

aà`

b10

x11

x13

y18

511

aß`

b10

x11

y10

a13

x15

y12

aà`bà`

29a7

a8b11

xà`yÜ`

x12y14

a6b9

xÝ`yá`

4

6

3

2

5

3, 4

5, 13

210

38

a9

a10

x14

x24

b21

y30

59

a24

x26

a23

b16

x24

y16

3ß`aÚ`Û`

a22b12

a20b10

x26y24

a22b18

x18y24

x17y28

×, a12

×, b19

×, a12b12

×, x6y6

×, a12b14

6

4

3

4, 2

10

3

6

ㄷ, ㄹ

xÞ`y¡`

### 239

42 지수의 차와 분배 p. 31~37

33

a3

a2

x6

1

1

1

1

5Ü`1

1 aà`

1a

xÝ`1

1 bÝ`

yß`1

2Ü`

a

xÜ`

1

1

1 aÛ`

xß`1

a¡`

aÝ`

1

1 x8

aÞ`

1

1 a5

2

6

6

5

7

3

2

a2 b2

x4y4

a10b5

x2y14

x12y9

a20b8

x12y24

64x15

25x10

-8a12

16x6 y4

81a4 b12

-a20 b10

-27x6y15

3, 10

6, 2

5, 16

2, 12

4, 9

5, -64

3, -8

` yÞ`

` y12

bÛ``

x 10 yÞ`

` b12

a 12 b18

x 20 y12

x24 y20

a 10 b30

x 21 y12

a9 6

x125 12

- xá`64

x 12 16y4

8a 6 b9

- a 15 b20

x8 36yß`

9y 10 4x4

64a 9 125b12

16a 12 81b20

2

6, 25

3, 8

4, 64

5, 8

7, 9

×, x6

×, 1

×, 25x8

×, 64x9y21

×, 8a 15 27b6

1 a5

### 331

28 단항식의 곱셈과 나눗셈 p. 39~45

10ab

6xyÛ`

-18xÛ`y

(4)

-2aÞ`bÜ`

6xÝ`yß`

3xÛ`y

4xÜ`y

5aÜ`bÛ`

;3!;aÛ`bÞ`

-14xÞ`yà`

;3\$;xß`yÞ`

20xà`y

36xÞ`yÝ`

-54xà`y11

-7aà`b14

-8a8b13

5x9y7

-3a11b6

;3@;xß`yÞ`

-2xy13

-72a8b5

48x19y15

-;2Á7;x13y5

6, 5

6, 8

5, 10

4, 8

4, 5

5, 7

2, 6

5aÞ`

-4a3

3x

5aÛ`bÜ`

-;2#;xÛ`y

-2xÛ`yÝ`

3xÞ`y8

b 5a

- 73xy

9xÜ`

;3\$;aÝ`bÛ`

-15xß`y8

- 20x y5

2x3y8

-xy12

2x3y2

-162a3b4

2x7y9

30x2y3

3yÞ` xÞ`

2x 5y

-;9@;a7b

9xÛ`2yÛ`

- 6 xyÝ`

6a3b7

10, 3

4, 5

12, 6

5, ;2!;

3, -4

6a

9xy2

-8x2 y6

- 5 abÜ`

-6x 3y5

4x8y3

15a4

12x8y6

- 4 3x

- 32xÜ`

-;3\$;x5y9

` 3x

16ab2

6ab

-3x4y

2x9y5

- 50 xÜ`

-10x 5y2

12

### 415

12xÞ`y13 다항식의 덧셈과 뺄셈 p. 47~52

9x-y

4x+5y

4x

-7x+7y

a-3b

-6x+6y

6a+b-3

-6x-2y-3

7x-y+4

2x+y

x+5y

3x+10y

3a+10b

-9x+13y

-4x+3y

5a+19b

-a+10b-9

4x+9y-1

x-19y+8

;4%;x-;4!;y

;4%;x+;6!;y

;1!5!;x+;1!5&;y

;6&;x+;3!;y

;6&;x+:Á6Á:y

5a+2b

-3x+6y

-5a+13b

-7x+2y+7

4a+3b

-4x+5y

×

×

×

×

3x2+3x-2

x2+5x+4

6x2-5x+2

-2aÛ`-3a+8

11xÛ`+3x+7

-xÛ`-7x+7

-7x2+7x+9

4a2+6a-10

-2xÛ`-2x+5

8a2-14a+1

a2+4a-11

-4xÛ`+9x+11

### 466

;2#;xÛ`+;3\$;x-:ª6°:

### 467

;1¦0;aÛ`+;2¦0;a-;2!0!;

### 468

;1¦2;xÛ`-;1Á2;x+;2!;

### 469

-;1¢5;xÛ`-;1¥5;x-;5!;

### 470

;6!;xÛ`-;1¦2;x+;6&;

2x2-2x-6

3xÛ`+8x+2

4xÛ`-5x-2

5xÛ`-x-7

-7xÛ`+6x+10

5x+y+6

7x-5y+4

9a-4b+13

2xÛ`-5x+3

aÛ`+4a+11

5xÛ`-8x+11

5xÛ`-4x+2

### 484

10 다항식의 곱셈과 나눗셈 p. 54~59

4a2+ab

-3x2+6x

-12a2+4a

9xÛ`+3xy

-4aÛ`+3ab

-20xÛ`+8xy-12x

-3a2-6ab+9a

x2-2xy

(5)

3xy+y2

-8a2+6ab

6aÛ`-3ab-9a

-12xy+2y2-6y

5x+3y

2x+3

-2x+1

3a-b

-4a+2b

-x-3y

;2#;x-y-2

12a-16b

18x-6y

6x+9

12a-18

-8x+10y

12a-18b-6

4a2-6a

14a2+2a

-3xÛ`-4xy

7a2-5ab

x2-14xy

10x2-10xy

6xy-10x+3y

-4xÛ`+2xÛ`y

aÛ`+3ab-14a

a2-b

3x-8

-2x-11

13a+b

3a-9b-2

7x-12y

5x-4y+3

-10aÛ`+4a

-x+y-4

4a2+5a

-10x2+17x

7a2-ab-2b2`

4x2+5xy+3yÛ`

4aÛ`+ab

7a2+2ab+2a

21

-1

-4

-16

28

6

5x-4

4y-5

-11x+6

2y-7

19x-13

y+13

x-7y

-18x+29y

;6%;x+2y

-30x+13y

16x+23y

4aÜ`bÛ`-6aÛ`bÜ`

### 555

-xÛ`y+4y+8 부등식의 성질 p. 63~68

×

×

×

xÉ2

x+3>5

4x<20

x-4¾10

3x>25

150-xÉ70

x6 ¾1

×

4

1, 2, 3

>

>

<

<

>

>

>

>

>

<

>

<

>

<

>

<

É

É

É

¾

¾

¾

>

¾

<

¾

<

É

2x+3É5

4x-3<-11

;2{;+1É3

;3{;-2¾-4

2-5xÉ-3

-;4#;x-1<-7

-5É3x-2É4

1Éx+3<7

5<2x-3<9

-4<5x-4É21

5É-x+6É12

-10É-3x-1<5

3 1 2

-3 -5 -4

4 2 3

6 4 5

0 -2 -1

7 5 6

-1 -3 -2

5 3 4

x>-5

x<3

x¾4

xÉ-1

x<2

x¾-6

x>7

### 78

① 일차부등식의 풀이 p. 70~75

+

x¾2-6

2x+5-6>0

3x-1-2x<1

-x-3x¾-3

4x+xÉ-1-2

×

×

×

a+4

a+5

a+-3

a+2

x>2

xÉ3

x¾-2

x¾2

(6)

x<-3

x<1

x<-9

x<4

x¾-3

x<1

x¾3

x>-6

xÉ1

x<0

x>5

x¾1

xÉ3, 3 4 1 2

x¾2, 3 4 1 2

x>2, 3 4 1 2

xÉ5, 6 7 4 5

x>2, 3 4 1 2

### 117

x¾-3, -2 -1 -4 -3

x¾1

x<-1

x¾-;4!;

x>-7

x¾-1

x>-5

x<-4

x>-1

xÉ-1

xÉ-3

x>1

x<-6

x>4

x<-1

x<3

xÉ-5

x>;2#;

xÉ8

x>-:Á3¼:

x<-2

x¾19

x¾2

x¾-4

x¾10

x>-6

xÉ15

xÉ-5

x¾-6

x>2

x> 1a

x<1

x<-1

x¾-3

x>2

x<;a%;

x¾-6

-5

4

-5

-11

-2

-2

### 162

④ 일차부등식의 활용 p. 77~82

2x+5, ② x+8

>, 2x+5>x+8

x>3

4

<, 3x+1<2x+4

x<3

1, 2

x+2

x+(x+2)>16

x>7

8, 10

x-1, x+1

(x-1)+x+(x+1)<54

x<18

16, 17, 18

2000, ② 600x

### ⑵

É, 2000+600xÉ6000

:ª3¼:

6

### ⑴

É, 1500(10-x)+2000x+2000É20000

xÉ6

6

### ⑴

8000+500x, ② 5000+800x

### ⑵

<, 8000+500x<5000+800x

x>10

11

### ⑴

<, 30000+2000x<10000+3000x

x>20

21

### ⑴

É, 1000+200(x-60)É4000

xÉ75

75

### ⑴

É, 10000+1500(x-15)É1200x

xÉ 1253

41

### ⑴

>, 800x>500x+1800

x>6

7

### ⑴

<, 900x+4000<1200x+2500

x>5

6

3x

<, 3x<30

x<10

10

x-8

¾, 2{(x-8)+x}¾40

x¾14

14

;2{;, ② ;4{;

É, ;2{;+;4{;É3

xÉ4

4

É, ;3{;+ x+14 É2

xÉ3

3

### ⑴

É, ;8Ó0;+5+;8Ó0;É20

xÉ600

600

### ⑴

(4-x)`km, 시속 1`km, (4-x)시간

É, ;2{;+(4-x)É3

x¾2

2

### ⑴

;10%0;_400, ② ;10*0;_x, ③ ;10^0;_(400+x)

### ⑵

¾, ;10%0;_400+;10*0;_x¾;10^0;_(400+x)

x¾200

200

60

### ⑵

É, 60É;10\$0;_(300+x)

x¾1200

1200

10

### ⑵

10¾;1ª0¼0;_(100-x)

x¾50

50

11

### 186

② 미지수가 2개인 연립일차방정식 p. 84~88

2, 1, -1

1, -1, 0

1, -3, 2

;2!;, 4, -7

4, -;2!;, -3

2, -1, -9

(7)

6, -3, 5

### 194

;4!;, ;3!;, -;6!;

×

×

×

×

×

300x+500y=5000

2x+3y=30

500x+700y=4200

3x+4y=31

2x+4y=42

2x+2y=37

3x+2y=90

×

×

×

### 216

3, 1, -1, (1, 5), (2, 3), (3, 1)

### 217

7, 5, 3, 1, -1, (7, 1), (5, 2), (3, 3), (1, 4)

### 218

(1, 8), (2, 5), (3, 2)

### 219

(8, 1), (6, 2), (4, 3), (2, 4)

(3, 2)

### 221

(1, 8), (3, 5), (5, 2)

3

-3

3

1

-2

;3%;

1

;5&;

8, 4

12, 2, 4, 32

### 232

3, 2, 24000, 1300

[x=3y 2x+3y=72

### 234

[500x+800y=4700 x-y=-1

### 235

(3, 5) ㉠ x 1 2 3 4 5 6 7 y 7 6 5 4 3 2 1 ㉡ x 1 2 3 4 5 y 9 7 5 3 1

### 236

(5, 5) ㉠ x 1 3 5 7 9 11 13 y 7 6 5 4 3 2 1 ㉡ x 1 2 3 4 5 6 7 8 9 y 9 8 7 6 5 4 3 2 1

×

×

a=2, b=8

a=-7, b=2

a=5, b=-1

a=-5, b=-11

a=9, b=13

a=2, b=5

①, ④

### 249

① 대입법과 가감법 p. 90~95

x=-2, y=3

x=1, y=3

x=2, y=2

x=-11, y=-5

x=6, y=4

x=2, y=3

x=-4, y=13

x=-1, y=2

x=2, y=-1

x=2, y=3

x=2, y=3

x=2, y=1

x=8, y=3

x=-2, y=1

x=3, y=-1

x=4, y=-2

x=2, y=1

x=-4, y=2

x=-1, y=2

x=2, y=-3

x=-1, y=4

x=5, y=1

x=1, y=-2

4

-㉡_3

_2-㉡, ㉠+㉡_3

_2-㉡, ㉠+㉡_5

-㉡_2, ㉠_2+㉡

_2-㉡_3, ㉠_3-㉡

x=3, y=1

x=-3, y=2

x=6, y=3

x=8, y=-10

x=-3, y=-1

x=2, y=0

x=2, y=-1

x=4, y=-1

x=-1, y=2

x=3, y=-2

x=-2, y=1

x=-5, y=-8

x=3, y=1

x=3, y=-2

x=4, y=1

x=3, y=3

x=-1, y=4

x=2, y=-1

x=-3, y=-2

x=2, y=-3

x=2, y=-2

a=2, b=3

a=2, b=3

a=-1, b=3

a=1, b=1

-2

5

-1

2

### 310

(8)

복잡한 연립일차방정식의 풀이 p. 97~103

x=7, y=1

3, 8, x=2, y=2

3, 2, x=1, y=2

[10x+y=8 x-y=3

x=1, y=-2

[-x-3y=6 x-5y=10

x=0, y=-2

[x-5y=-2 2x-3y=3

x=3, y=1

### 317

[4x-3y=-1 5x+y=13

x=2, y=3

### 318

[-x+3y=-6 3x-4y=8

x=0, y=-2

[x+y=1 6x+5y=2

x=-3, y=4

[x+2y=3 4x+3y=7

x=1, y=1

### 321

-4, 10, 2, 3, x=-2, y=2

### 322

-5, 4, 4, 3, x=10, y=13

x=4, y=9

x=5, y=2

x=-10, y=-19

x=3, y=-7

x=1, y=2

### 328

[3x-2y=18 3x-4y=12

x=8, y=3

x=2, y=1

x=5, y=2

x=4, y=3

3, 4, 5, 2

x=6, y=14

6, -8, 4, 6

x=-1, y=-2

x=11, y=5

x=1, y=1

x=-2, y=5

x=4, y=-6

x=5, y=4

x=-3, y=5

x=-4, y=10

x=1, y=2

x=6, y=4

x=6, y=-1

x=-3, y=1

a=4, b=3

a=3, b=2

a=-7, b=2

a=3, b=4

### 349

x+3y, x-y, x=8, y=0

x=2, y=2

x=7, y=4

x=2, y=1

x=7, y=1

x=5, y=2

### 355

2x-y, 3x-4y-1, x=-2, y=-1

x=-3, y=1

x=3, y=3

x=1, y=-3

x=11, y=-1

x=3, y=-5

x=2, y=-2

x=7, y=4

x=-1, y=3

x=2, y=-2

x=-1, y=2

x=-8, y=-16

x=4, y=2

해가 무수히 많다.

해가 없다.

해가 무수히 많다.

해가 없다.

해가 무수히 많다.

a=9, b=6

a=-4, b=-6

a=6, b=12

a=;2!;, b=4

a=-2, b=2

a=-5, b=6

2

3

2

12

1

-3

### 387

⑤ 연립일차방정식의 활용 p. 105~111

[x+y=72x=y+20

x=9, y=-2

9, -2

[x+y=-53y=x+7

x=-8, y=3

x=-8, y=3

### ⑴

[x+y=810y+x=10x+y+18

x=3, y=5

35

### ⑴

[x+y=910y+x=10x+y-9

x=5, y=4

54

### ⑴

[x+y=9900x+300y=4500

x=3, y=6

3, 6

### ⑴

[3x+2y=26004x+y=1800

x=200, y=1000

200, 1000

[x+y=134x+2y=40

x=7, y=6

7, 6

[x+y=152x+4y=38

x=11, y=4

11, 4

### 396 ⑴

[x+y=55x+15=2(y+15)+1

x=42, y=13

42, 13

### 397 ⑴

[x+y=62x-10=5(y-10)

x=45, y=17

45, 17

(9)

[x+6y=12x+3y=1

x=;3!;, y=;9!;

3

[x+y=205x-2y=44

x=12, y=8

12

### ⑴

[3x-2y=13 3y-2x=3

x=9, y=7

16

x+y=5;6{;+;3};=1

x=4, y=1

4, 1

### [

x+y=152;6Ó0;+;4};=3

x=150, y=2

150, 2

### [

x+y=1000;10{0;=;6Õ0;

x=625, y=375

625

### [

x+y=60;7Ó0;=;8Õ0;

x=28, y=32

28

[x=y+2060x=90y

x=60, y=40

40

[x=y+1040x=80y

x=20, y=10

10

;3%;x-;3%;y=10

;3!;x+;3!;y=10

x=18, y=12

18, 12

### [

x+y=600;10%0;x+;10*0;y=;10^0;_600

x=400, y=200

400, 200

### [

x+y+200=1200 ;10^0;x+;1Á0¼0;y=;10&0;_1200

x=400, y=600

400, 600

### [

;10{0;_100+;10}0;_200=;1ª0¼0;_300 ;10{0;_200+;10}0;_100=;1Á0°0;_300

x=10, y=25

10, 25

15살

9분

### 414

900`g 함수의 뜻 p. 115~119

### 1

◯, x 1 2 3 4 y y 0 1 2 3 y

### 2

×, x 1 2 3 4 y y 1 1, 2 1, 3 1, 2, 4 y

### 3

◯, x 1 2 3 4 y y 1 2 2 3 y

### 4

×, x 1 2 3 4 y y 없다. 1 1 1, 3 y

### 5

×, x 1 2 3 4 y y -1, 1 -2, 2 -3, 3 -4, 4 y

### 6

×, x 1 2 3 4 y y 1, 2, y 2, 4, y 3, 6, y 4, 8, y y

### 7

◯, x 1 2 3 4 y y 0 0 1 2 y

### 8

◯, x(개) 1 2 3 4 y y(원) 800 1600 2400 3200 y

### 9

◯, x`(cm) 1 2 3 4 y y`(cmÛ`) 1 4 9 16 y

### 10

◯, x`(cm) 1 2 3 4 y y`(cm) 12 6 4 3 y

### 11

◯, x(시간) 1 2 3 4 y y`(km) 60 120 180 240 y

x+1, y=x+1

3x, y=3x

;[!;, y=;[!;

100x, y=100x

12x , y=12x

6, 7, x+3, y=x+3

### 18

2, 4, 6, 8, 2x, y=2x

### 19

2, 4, 6, 8, 2x, y=2x

### 20

500, 1000, 1500, 2000, 500x, y=500x

### 21

99, 98, 97, 96, 100-x, y=100-x

### 22

24, 12, 8, 6, 24x , y=24x

0, 0, 2, 2

8, -12

6, -18

6, -4

### 33

;2!;, 2, 8, 8, -2, -2, -2

-2, 2

-6

15

2

2

24

18

4

-1

-5

-1

2

-12

9

3

-2

;8!;

3

-12

-4

### 56

(10)

일차함수 y=ax+b의 그래프 ⑴ p. 121~126

×

×

×

×

y=3x, ◯

y=xÛ`, ×

y=5000-500x, ◯

y= 20x , ×

y=80x+50, ◯

y=500-5x, ◯

2

7

;4#;

3

2

-2

5

-4, -2, 0, 2, 4

### 79

-2, -1, 0, 1, 2 y x O 2 4 -2 -2 -4 -4 2 4 y=2x y x O 2 4 -2 -2 -4 -4 2 4 y= 1 -2 x

4, 2, 0, -2, -4

### 81

2, 1, 0, -1, -2 y x O 2 4 -2 -2 -4 -4 2 4 y=-2x y x O 2 4 -2 -2 -4 -4 2 4 y=- 1-2 x

x

y

### 86

x y -2 -1 0 1 2 y y=x y -2 -1 0 1 2 y y=x+2 y 0 1 2 3 4 y y x O 2 4 -2 -2 -4 -4 2 4 y=x+2 y=x

### 87

x y -2 -1 0 1 2 y y=3x y -6 -3 0 3 6 y y=3x-4 y -10 -7 -4 -1 2 y y x O 2 4 -2 -2 -4 -4 2 4 y=3x-4 y=3x

### 88

x y -2 -1 0 1 2 y y=-x y 2 1 0 -1 -2 y y=-x+2 y 4 3 2 1 0 y y x O 2 4 -2 -2 -4 -4 2 4 y=-x+2 y=-x

### 89

x y -2 -1 0 1 2 y y=-3x y 6 3 0 -3 -6 y y=-3x-4 y 2 -1 -4 -7 -10 y y x O 2 4 -2 -2 -4 -4 2 4 y=-3x-4 y=-3x

3

-3

2

-5

y=2x+4

y=4x-5

y=-x+;2#;

y=-;4#;x-2

y=x

y=-5x

y=;2#;x-3

y=-;2!;x-3

-5

7

-11

-1

2

### 107

;2#;

(11)

일차함수 y=ax+b의 그래프 ⑵ p. 128~133

-3, 3

4, 2

-2, 4

-2, -4

-2, 2

3, 6

1, -3

6, 4

6, -3

-2, -6

### 121

y x O 2 4 -2 -2 -4 -4 2 4

### 122

y x O 2 4 -2 -2 -4 -4 2 4

### 123

y x O 2 4 -2 -2 -4 -4 2 4

### 124

y x O 2 4 -2 -2 -4 -4 2 4

-2, 4

### 126

4, -2 y x O 2 4 -2 -2 -4 2 4 -4 y x O 2 4 -2 -2 -4 2 4 -4

1, 3

### 128

-3, -1 y x O 2 4 -2 -2 -4 2 4 -4 y x O 2 4 -2 -2 -4 2 4 -4

### 129

1, x y -1 0 1 2 y y y 0 1 2 3 y

### 130

-2, x y -1 0 1 2 y y y 6 4 2 0 y

### 131

;2!;, x y -1 0 1 2 y y y -;2%; -2 -;2#; -1 y

### 132

-;2!;, x y -1 0 1 2 y y y -;2!; -1 -;2#; -2 y

+3, 1

+6, ;3@;

+3, -;3@;

-6, -;2#;

3

15

-8

6

12

4

2

-;2%;

-2

;3!;

-;4!;

;2%;

4

7

6

5

10

-10

-12

### 156

y x O 2 4 -2 -2 -4 -4 2 4

### 157

y x O 2 4 -2 -2 -4 -4 2 4

### 158

y x O 2 4 -2 -2 -4 -4 2 4

2, 3

### 160

-1, 2 y x O 2 4 -2 -2 -4 2 4 -4 y x O 2 4 -2 -2 -4 2 4 -4

### 161

;2!;, -1 y x O 2 4 -2 -2 -4 -4 2 4

### 164

(12)

일차함수 y=ax+b의 그래프의 성질 p. 135~139

### 165

O -2 -2 2 2 4 4 -4 -4 y x

2

-4

2

증가

2

### 172

O -2 -2 2 2 4 4 -4 -4 y x

3

1

-;3!;

아래

감소

3

ㄱ, ㄷ, ㅂ

ㄴ, ㄹ, ㅁ

ㄱ, ㄷ, ㅂ

ㄴ, ㄹ, ㅁ

ㄱ, ㅁ

ㄴ, ㄷ, ㄹ, ㅂ

>, >

<, <

>, <

<, >

>, <

<, <

>, >

<, >

1, 2, 4사분면

### 194

2, 3, 4사분면 O x y O x y

1, 2, 3사분면

1사분면 O x y O x y

3사분면

2사분면 O x y O x y

일치

평행

평행

일치

ㄴ과 ㅁ

ㄱ과 ㅂ

4

-1

;5@;

2

-8

2

;2!;

1

a=2, b=3

a=3, b=-1

a=-4, b=2

a=2, b=4

a=-;2!;, b=-;2!;

a=-3, b=-2

a=7, b=5

### 224

① 일차함수의 식 세우기 p. 141~145

y=2x+2

y=3x-1

y=-2x+5

y=-3x+;2!;

y=4x-2

y=-x+3

y=-;4!;x-2

y=;3@;x+2

y=-2x-1

y=3x+4

y=-3x+1

y=5x+6

y=-4x+3

y=2x+1

y=-x+2

y=3x+7

y=-4x+8

y=;2!;x-1

y=-;4#;x+;4!;

y=;2!;x+;2#;

y=-;3@;x+;3!;

y=-2x+3

y=-3x+6

y=-;3@;x+4

y=;5@;x+2

1, y=x+5

1, y=x+1

-5, y=-5x+10

-2, y=-2x+12

y=2x+1

y=4x-7

y=-3x+2

y=-x+4

3, y=3x-3

### 259

;5@;, y=;5@;x+;5&;

### 260

-;2!;, y=-;2!;x+;2!;

### 261

-;2#;, y=-;2#;x+3

4, y=4x+4

2, y=2x-6

-3, y=-3x-6

y=;3!;x-1

y=-6x-6

-2, y=-2x+4

;3!;, y=;3!;x+1

### 269

-;5#;, y=-;5#;x-3

### 272

y=-4x-7

(13)

일차함수의 활용 p. 147~151

1200

y=1200x

8400

15

120

y=120x

300

6

y=5x+10

35

8

5

y=90-5x

65

11

y=1.5x+25

43

20

0.5

y=30-0.5x

23

48

y=72-2x

22

36

;1Á2;

y=60-;1Á2;x

45

720

y=300-60x

180

4

1.5

y=4-1.5x

1

80

y=15x

75

4

12-2x

y=96-8x

72

5

2.5

y=200-2.5x

125

48

120

y=300-120x

240

1, 30

8

8

4

6

;2(;

;2(;

### 295

⑤ 일차함수와 일차방정식의 관계 p. 153~158

### 296

x y -5 -3 -1 1 3 y y y -3 -1 1 3 5 y

### 297

y4 x -2 -2 2 4 -4 -4 2 O

### 298

y4 x -2 -2 2 4 -4 -4 2 O

### 299

x y -4 -2 0 2 4 y y y -5 -4 -3 -2 -1 y

### 300

y4 x -2 -2 2 4 -4 -4 2 O

### 301

y4 x -2 -2 2 4 -4 -4 2 O

×

×

×

y=-x+1

y=x-3

y=;2!;x-2

y=-2x-3

y=-;3!;x+3

y=2x+;4!;

y=;2%;x+;2!;

y=-;6!;x+;3@;

1, -3, 3

-2, -;2%;, -5

1, 2, -2

-;2!;, -4, -2

;2!;, 1, -;2!;

### 322

-;3@;, ;4#;, ;2!;

;9!;, -18, 2

### 324

y=3x-1 4 y x -2 -2 2 4 -4 -4 2 O

### 325

y=-2x+3 4y x -2 -2 2 4 -4 -4 2 O

(14)

### 326

y=;3!;x-1 4 y x -2 -2 2 4 -4 -4 2 O

### 327

y=-;2!;x+1 4 y x -2 -2 2 4 -4 -4 2 O

×

×

×

×

×

### 338

x y 3 3 3 3 3 y y y -4 -2 0 2 4 y

### 339

y x O 2 4 -2 -2 -4 2 4 -4

3, 3, y

### 343

x y -4 -2 0 2 4 y y y 3 3 3 3 3 y

### 344

y x O 2 4 -2 -2 -4 2 4 -4 y x O 2 4 -2 -2 -4 2 2x+8=0 -12x=2 4 -4

3, 3, x

x=-4

x=-2

y=1

y=-4

x=-3

x=1

y=4

y=-2

x=3

y=1

y=-2

y=3

x=-4

x=0

x=1

y=0

3

5

4

2

### 370

② 연립일차방정식의 해와 그래프 p. 160~164

x=3, y=2

x=1, y=4

x=-1, y=2

x=-2, y=-3

y=-x+4, y=x+2

### 376

y=-x+44y y=x+2 x -2 -2 2 4 -4 -4 2 O

1, 3, 1, 3

x=4, y=-3

### 379

x=0, y=-2 4 y x+y=1 x+2y=-2 x -2 -2 2 4 -4 -4 2 O 4 y 3x-y=2 x+2y=-4 x -2 -2 2 4 -4 -4 2 O

a=2, b=1

a=3, b=2

a=2, b=3

a=2, b=5

(5, 7)

(2, 1)

(-1, -1)

(-1, 1)

### 388

(2, -4) y x O 2 4 -2 -2 -4 2 4 -4 2y=4 3y+11=2

(15)

(2, 0)

해가 없다.

### 391

x=3, y=-3 O -2 -2 2 2 4 4 -4 -4 y x 2x-y=-2 4x-2y=6 O -2 -2 2 2 4 4 -4 -4 y x x+3y=-6 3x+2y=3

### 392

해가 무수히 많다. O -2 -2 2 2 4 4 -4 -4 y x x+y=3 (2x+2y=6)

없다., 없다.

무수히 많다., 무수히 많다.

1개, 한 쌍

없다., 없다.

a+-1

a+-;2!;

a+8

a+6

a+1

2

3

;3!;

a=2, b+6

a=-1, b+-4

a=4, b=1

a=6, b=-2

a=4, b=2

a=2, b=:Á2°:

### 411

2 ㈏ -2 O -2 -2 2 2 4 4 -4 -4 y x 2x+y=2 x-y=4

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