# How do you solve the system y=x+1 and x+y=9?

Nov 19, 2015

Substitute for y in the second equation to get a value for x, and then solve for y

#### Explanation:

$y = x + 1$
Therefore $x + \left(x + 1\right) = 9$
$2 x = 9 - 1$
$2 x = 8$
$x = 4$
$y = 4 + 1$
$y = 5$