SOLUTION: Solve by the substitution method. 5x+4y=7 -3x+y=7

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Question 345538: Solve by the substitution method.
5x+4y=7
-3x+y=7
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.5x%2B4y=7
2.-3x%2By=7
From eq. 2,
y=3x%2B7
Substitute into eq. 1,
5x%2B4%283x%2B7%29=7
5x%2B12x%2B28=7
17x=-21
highlight%28x=-21%2F17%29
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y=3%28-21%2F17%29%2B7
y=-63%2F17%2B119%2F17
highlight%28y=56%2F17%29