answer ALL attachments :){ga – 3 d = 3

–

Solve each system by elimination.

4x – 6y = – 26

9a – 3d = 3

30.

31.

13

2x – 3y = 6

20x + 5y = 120

33.

34.

16x – 9y = 9

10x + 7.5y = 80

2x – 3y = -1

J5x – 2y = -19

36.

37.

13x + 4y = 8

12x + 3y = 0

Sy = 4

3x + 2y = 10

39.

40.

3x + y = 6

(6x + 4y = 15

{

2a + 3b = 12

32.

5a – b = 13

ſ 6x – 2y = 11

35.

-9x + 3y = 16

r + 3s = 7

38.

2r s = 7

3m + 4n = -13

41.

15m + 6n = -19

– x

42. Elections In a mayoral election, the number of votes for the incumbent was

25% more than the number for the opponent. Altogether, the two candidates

received 5175 votes. How many votes did the incumbent mayor receive?

43. Writing Explain how you decide whether to use substitution or elimination to

solve a system.

Solve each system.

5x + y = 0

ſ2m = -4n – 4

7x + 2y = -8

44.

45.

46.

15x + 2y = 30

3m + 5n = -3

8y = 4x

ſv = 91 + 300

80x + 60y = 85 $2x + 3y = 0

47.

48.

49.

71 + 400

100x – 40y = 20

17x 3(2y) + 3

4y

+ 3 = 300

0.02a 1.55 4 | 4y = 2x

50.

51.

52.

= 300

0.5b – 0.02a

= 1.8

2x + y = { + 1

13x – 4y

For each system, choose the method of solving that seems easier to use.

Explain why you made each choice.

3x – 5y = 26 { y = 3x – 3

2m + 3n = 12

54.

55.

56.

-x + 3y = 18

5m + n = -13

(3x – y = 5

3y = 4

S6x – 3y – 3

57.

58.

59.

Ly = 4x + 2

2x – 5y = -6

15x – 5y = 10

{–

–

S2x

ge

62. Break-Even Point A theater production costs $40,000 plus $2800 per

performance. A sold-out performance brings in $3675. How many sold-out

performances will the production need to break even?

63. Weather The equation F = ?C + 32 relates temperatures on the Celsius and

Fahrenheit scales. Does any temperature have the same number reading on

both scales? If so, what is the number?

Find the value of a that makes each system a dependent system.

Sy = 3x + a

64.

Зу = 2х

65.

{y = £ + 4

13x – y = 2

66.

16y – a – 4x = 0 12y

x=a

rep

ase

Use the following system of equations for Exercises 67-70.

5x – 3y = 11

|-x + 12y = 3.5

67. If you want to solve the system by eliminating < (with addition),
by what would you multiply the second equation?
68. If you want to solve the system by eliminating y (with addition),
by what would you multiply the first equation?
69. What is the value of x in the solution? Enter your answer as a decimal.
70. What is the value of y in the solution? Enter your answer as a decimal.
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