Question

Dado o sistema 5x-y = 1/125 3x+y =243, calcule o valor de x e y

Answer 1

5x-y=1/125
125*(5x)*(-y)=625x-125y=0

3x+y=243 y=243-3x

625x-125(243-3x)=0
625x-30375-375x=0
625x-375x-30375=0
250x=30375
x=30375/250
x=121,5