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2x+y=3
x+y=1/(-1)
2x+y=3
-x-y=-1
2x+y=3
x=2
-2-y=-1
-y=-1+2
-y=1/(-1)
y=-1
x=2
y=-1
2x+y=3
x=1-y
2x+y=3
x=1-y
2(1-y)=3
x=1-y
2-2y=3
x=1-y
-2y=3-1
x=1-y
-2y=2 |:(-2)
x=1-y
y=-1
x=1-(-1)
y=-1
x=1+1
y=-1
x=2
y=-1