Question

{X-2y = 4
{-X-4Y = 10

Answer 1

{x-2y = 4

x = 4 +2y

{-x-4y = 10

-  ( 4 +2y ) - 4y = 10

- 4 - 2y - 4y = 10

- 4 - 10 = 6y

- 14 = 6y

6y = - 14

$y =\frac{-14(:2)}{6(:2)}$

$y=\frac{-7}{3}$

y = - 2, 33

x = 4 +2y

$x = 4 +2.(\frac{-7}{3} )$

$x=4+\frac{-14}{3}$

$x=\frac{12-14}{3}$

$x=\frac{-2}{3}$

x = - 0, 66