Question 30938
I think you copied the problem wrong.  In the form you have written there is only 2 solutions one for x and one for y.

in this case y=100 and x=300.

To graph these rework them into slope-intercept form.  

See this lesson for more information.  http://www.algebra.com/algebra/homework/Graphs/Graphing-a-Line:-Slope-Intercept-vs-Standard-Form.lesson

Again please double check the problem.