Question

Metodo de igualacion:
-2x - y = 5
y - 7x = 10

Answer 1

Respuesta:

x = -5 / 3

y = -5 / 3

Explicación paso a paso:

L1 -2x - y = 5

L2 y - 7x = 10

-2x - y = 5

-2x = 5 + y

x = (5 + y)/(-2)

y - 7x = 10

-7x = 10 - y

x = (10 - y)/(-7)

(5 + y)/(-2) =  (10 - y)/(-7)

(-7)(5 + y)=(-2)(10 - y)

-35 - 7y = - 20 + 2y

-7y - 2y = -20 + 35

-9y = 15

y = -15 / 9

y = -5/3

x = (10 - y)/(-7)

x = (10 -(-5/3) / (-7)

x = (10 + 5/3)/(-7)

x = ((30+5)/3) / (-7)

x = (35/3) / (-7)

x = -35 / 21

x = -5/3