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-4y-y= -43 Ec(2)
Despejamos 'y' en Ec (2)
-5y=-43
y=43/5
Sustituimos el valor de 'y' en Ec (1)
3x + 5(43/5) = 45
3x + 43 = 45
3x = 45-43
3x= 2
x=2/3
La solucion para el sistema de ecuaciones es: x=2/3 y=43/5