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x=-1+y
x= y-1
2x-y=4
2(y-1)-y=4
y-2=4
y=4+2
y=6
x=y-1
x=6-1
x=5
Luego,
x=5
y=6
2º Sistema
2x+5y=−5
2x=−5−5y
x=-5-5y/2
x=-5(1+y)/2
4x-3y=3
-10-13y=3
-13y=13
y=-13/13
y=-1
x=-5(1+ (-1) )/2
x=0
Luego,
x=0
y=-1
3º Sistema
2y+y=3
3y=3
y=1
x−y=3
x−1=3
x=3+1
x=4
Luego,
x=4
y=1