# How do you solve #9x-9y=27#, #9y-9x= -27# by graphing?

##### 1 Answer

Feb 21, 2018

#### Answer:

*all the points that belong to the straight line 9x-9y=27*

#### Explanation:

Solving a system mean finding the common solutions of the equations. Geometrically speaking that means finding the points they have in common on a Cartesian plane, in other words the solutions of a system are the point where the functions intercect.

In your case you have two equations that are the same.

In fact:

The two equations occupy the same points in the plane so the solution is

*all the points that belong to the straight line 9x-9y=27*

graph{9x-9y=27 [-10, 10, -5, 5]} graph{9y-9x=-27 [-10, 10, -5, 5]} *