Question

x-5=8
-7x+8y=25
metodo de igualacion

Answer 1

En ambas ecuaciones despejas x.

1ra--------->x=13

2da---------------->x=(25-8y)/7

Al igualar queda:

(25-8y)/7=13

Despejas Y:

25-8Y=13*7

25-8Y=91

-8Y=91-25

-8Y=66

Y=66/-8

Y=-8,25