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-3x-4y=-1
x=5-y
-3(5-y)-4y=-1
x=5-y
-15+3y-4y=-1
x=5-y
-15-y=-1
x=5-y
-y=14 |:-1
x=5-y
y=-14
x=5-(-14)=19
-3x-4y=-1
y=5-x
-3x-4(5-x)=-1
-3x-20+4x=-1
x=19
y=5-19
y=-14