2x+y=1 y=-x+4
2x+y=1
y=-x+4
2x+y=1 |*(-1)
x+y=4
-2x-y=-1
______________
-x=3
x=-3
-3+y=4
y=7
2x+(-x)+4=1-3x=1-4-3x=-3/(-3)x=1
2x+(-x+4)=1
x+4=1
x=5
y=-5+4
y=-1
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2x+y=1
y=-x+4
2x+y=1 |*(-1)
x+y=4
-2x-y=-1
x+y=4
______________
-x=3
x=-3
-3+y=4
y=7
x=-3
y=7
2x+(-x)+4=1
-3x=1-4
-3x=-3/(-3)
x=1
2x+y=1
y=-x+4
2x+(-x+4)=1
y=-x+4
x+4=1
y=-x+4
x=5
y=-5+4
x=5
y=-1