SOLUTION: using substitution how do i figure out this problem? 2x+y=-15 y-5x=6

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Question 425176: using substitution how do i figure out this problem?
2x+y=-15
y-5x=6
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
2x+y=-15
y-5x=6
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Solve each for "y":
y = -2x-15
y = 5x+6
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Substitute and solve for "x":
-2x-15 = 5x+6
7x = -21
x = -3
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Solve for "y":
y = 5x+6
y = 5*-3+6
y = -9
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Cheers,
Stan H.