Question

7x-4y=-2 -5x+6y=1 por el metodo de sustitucion

Answer 1

7x - 4y = -2
-5x + 6y = 1

Despejamos x de la 1)
7x = 4y -2
x = (4y -2)/7

Sustituimos en 2)

-5[(4y-2)/7] + 6y = 1
(-20y + 10)/7 = 1 - 6y
-20y + 10 = 7 - 42y
42y - 20 y = 7 - 10
22y = -3
y = -3/22

sustituimos

x = [4(-3/22)-2]/7
x = [-12/22 - 2]/7
x = [-6/11 - 2]/7
x = -6-22/77
x = -28/77
x= -4/11