SOLUTION: x+y=0,3x+y=4 Solve by substitution

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Question 288912: x+y=0,3x+y=4 Solve by substitution
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
3x+y=4
x+y=0
2x=4
x=2
y=-2
now by substitution
x=-y
3*(-y)+y=4
-2y=4
y=-2
x=-y
x=2