Question

Use elimination to solve the system 4x + 7y = –14 and 8x + 5y = 8 for x. Round to the nearest tenth.

Answer 1

x = 3.5

y = - 4

Explanation:

2(4x + 7y = -14)

8x + 14y = -28

8x + 5y = 8

- (8x + 14y = -28)

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- 9y = 36

y = 36/-9

y = - 4

4x + 7y = - 14

4x + 7(- 4) = - 14

4x -28 = - 14

4x = 14

x = 14/4

x = 3.5