Question

x + 2y=4
x+y=10 cual es el valor de y?​

Answer 1

x + 2y = 4

x + y = 10 (-2)

x + 2y = 4

- 2x - 2y = - 20

- 1x = - 16

1x = 16

(x = 16)

16 + 2y = 4

2y = 4 - 16

2y = - 12

y = - 12 / 2

(y = - 6)

COMPROBAMOS:

16 + 2 (-6) = 4

16 - 12 = 4

4 = 4

16 + (-6) = 10

16 - 6 = 10

10 = 10