SOLUTION: 3x+y=10 y=-2x+4 solve this by using substitution

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Question 356620: 3x+y=10
y=-2x+4
solve this by using substitution
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Substitute the bottom equation into the top equation:
3x+(-2x+4)=10.
3x-2x+4 = 10.
x = 6. Then
y = -2(6) + 4 = -12+4 = -8.