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3x+y=5-> y=5-3x
2x-3(5-3x)=-4
2x-15+9x=-4
11x=-4+15
x=11/11
→x=1
remplazamos en y
y=5-3(1)
→y=2
Comprobación
2x-3y=-4
2(1)-3(2)=-4
2-6=-4
3x+y=5
3(1)+(2)=5
3+2=5