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3x=-16
x=5.3
4x-5y=7
4(5.3)-5y=7
21.3-7=5y
14.3=5y
2.86=y
1. Mínimo común múltiplo de 3 y 4: 4,3
*4= 12x+108y=44
*-3=-12x+15y=-21
____________
0+123y=23
y=23/123
y=0.18
Se sustituye "y" en la ecuación 2
4x-5(0.18)=7
4x-0.9=7
4x=0.9+7
4x=7.9
x= 7.9/4
x= 1.975
Solución del sistema: P(1.975;0.18)