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2x+1=y
x-3y=-13
y=2x+1
x-3(2x+1)=-13
y=2x+1
x-6x-3=-13
y=2x+1
-5x=-10 /; (-5)
x=2
y=2*2+1=5
x=2
y=5
d]
x/4+2y=8 /*4
2x-7y=-5
x=32-8y
2(32-8y)-7y=-5
x=32-8y
64-16y-7y=-5
x=32-8y
-23y=-69 /;(-23)
y=3
x=32-8*3=8
x=8
y=3