SOLUTION: Please help with this problem:Solve the linear system using elimination. -3x-y=8 7x+y=-12 thank you

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Question 539723: Please help with this problem:Solve the linear system using elimination.
-3x-y=8
7x+y=-12
thank you
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
-3 x -1 y = 8 .............1
7 x + 1 y = -12 .............2
Eliminate y
Add the two equations
4 x = -4
/ 4
x = -1
plug value of x in (1)
-3 x + -1 y = 8
3 + -1 y = 8
-1 y = 8 -3
-1 y = 5
y = -5
m.ananth@hotmail.ca