# How do you solve x-y=4 and x+y=12?

Apr 6, 2016

$x = 8$
$y = 4$

#### Explanation:

first write both equations one above the other so
$x + x = 2 x$
$- y + y = 0$
$12 + 4 = 16$
then find x $2 x = 16$
$x = 8$
then use the first equation and find y
$8 - y = 4$
$- y = - 4$
$y = 4$