Idiot\'s Guides Basic Math and Pre-Algebra

Extra Practice Answers 329

55.

56. y = 6 –^35 x


57. x + y = 8

1123 x 2 x 11

x 2

1125 x 1

-5x -10

-2 062

-2

2

4

6

-4

-6

-5-6-7-8 -4 -1-3 134 5 789

-8

-9

-1

-3

-5

-7

8

9

1

3

5

7

10 11 12

-10

10

y

x

-2 062

-2

2

4

6

-4

-6

-5-6-7-8 -4 -1-3 134 5 789

-8

-9

-1

-3

-5

-7

8

9

1

3

5

7

10 11 12

-10

10

y

x

45. 
    

    12.5% increase

    
    


46. 
    

    3 x 2 7 x 1 12 2 2 x 1 5 5 -6x 1 17

    
    


47. 
    

48.^35 x^2 23 1 15 x^212
5

50 x 2 25

5

5 510 x 2 5

49.

9 t 9 t

18 t

9 t

510 t^2 2 1 8 t^1 2552

2 5t 2 1 1 8 t 1 2

50.

51.

52.

53.

54.

675 600

600 100

75

600 100

600 7500

12.5

x

x

x

x











4 5 2 3 x 2 29 x 2 7 5 20 2 12 x^2 18 x^1 14 5 34 2 30 x

-7 5y 22 2 8 6 25 y 5 -35y 1 14 2 48 1 40 y 5 y 2 34

7 x 2 12 5 5 x 1 4

2 x 2 12 5 4

2 x 5 16

x 5 8

3 2x 2 9

1

3

5 -3 x 1 5

6 x 2 27 5 -3x 215

9 x 2 27 5 -15

9 x 5 12

x 5 1

11 t 2 49 5 2 7t 2 5

11 t 2 49 5 14 t 2 10

-3t 5 39

t 5 -13

-4y 26 -11y 11

7 y 261

7 y

1

7

y