SOLUTION: substitution 5x+2y=7 -2x+2y=-14

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Question 838390: substitution 5x+2y=7 -2x+2y=-14
Answer by Fombitz(32388) About Me  (Show Source):
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1.5x%2B2y=7
2.+-2x%2B2y=-14
From eq. 1,
2y=7-5x
Substitute into eq. 2,
-2x%2B7-5x=-14
-7x=-21
x=3
Then,
2y=7-5%283%29
2y=7-15
2y=-8
y=-4