# How do you solve the system of equations: x - 3y - 4 = 0 and x + 2y - 4 = 0?

##### 1 Answer
Aug 7, 2015

I fond:
$x = 4$
$y = 0$

#### Explanation:

You can multiply the second equation by $- 1$ and add together the two equations in columns):
$\left\{\begin{matrix}x - 3 y - 4 = 0 \\ \textcolor{red}{- x - 2 y + 4 = 0}\end{matrix}\right.$ add them:
$0 - 5 y + 0 = 0$
$y = 0$ substitute bach into the first:
$x - 0 - 4 = 0$
$x = 4$