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x= (5-3y)/2
3x+2y=1
3(5-3y)/2+2y =1
15-9y+4y=2
y=2,6
3x+2y=1
3x+2(2,6)=1
x=-1,4
b)2x-3y=13
2x+4y=6
_____________-
-7y=7
y=-1
2x+4(-1)=6
x=5