Question

Método de igualación x-5y=8 -7x+8y=25

Answer 1

X=8+5y
X=25-8y/-7

-7(8+5y)=25-8y
-56-35y=25-8y
-35y+8y=25+56
-27y=81
Y=81/-27
Y=-3

X=8+5y
X=8-15
X=-7

Answer 2

Respuesta:

y= -81/32

x=-149/32

Explicación paso a paso:

x - 5y = 8

-7x + 8y = 25

*eliges qué vas a coger, la x o la y (yo voy a coger la x)

x = 8 + 5y

x = (25 - 8y) / -7

*igualas*

8 + 5y = (25 - 8y) / -7

-56 + (-40y) = 25 - 8y

-56 - 40y = 25 - 8y

-40y + 8y = 25 + 56

-32y = 81

y = -81/32                        x = -149/32