SOLUTION: Solve the system of equations x + y = -7 x - 2y = 11

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Question 332847: Solve the system of equations
x + y = -7
x - 2y = 11
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
x + y = -7
-(x - 2y = 11) subtract)
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3y=-18
y=-18/3
y=-6 ans.
x-6=-7
x=-7+6
x=-1 ans.
Proof:
-1-2*-6=11
-1+12=11
11=11