4 years ago

Please answer the question from the attachment.

Mathematics

1 answer:

ryzh [129]4 years ago

5 0

-x - 7y = 18

4x + 7y = -30

The -7y and 7y cancel by addition.

Thus, 3x = -12

Divide both sides by 3

x = -4

Plug in -4 for x

Thus, -(-4) - 7y = 18

4 - 7y = 18

Subtract 4 to both sides; 4 - 4 - 7y = 18 - 4

Simplify, -7y = 14

Divide both sides by -7; -7y/-7 = 14 / -7

y = -2

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