3x+2y=-7 -x+y=4

3x+2y=-7, -x+y=4
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1 Answer

line 1: 3x+2y=-7

line 2: -x -y=4   or -2x -2y=8

line 1+ line 2...(3x-2x) +(2y-2y)=(-7+8)

or x=1

line 2...y=-x-4=-1-4=-5

y=-5
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