can you solve by substitution
-3x+3y=3
-5x+y=13
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-3x+3y=3
-x+y=1
y=x+1
-5x+y=13
-5x+(x+1)=13
-4x=12
x=-3
therefore y=-3+1=-2
-x+y=1
y=x+1
-5x+y=13
-5x+(x+1)=13
-4x=12
x=-3
therefore y=-3+1=-2
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