# How do you use the graph to state the solution for the system x -y = 4 (line a) and x + y = 4 (line b)?

Apr 1, 2015

Find two points on the line for each of the equations (the intercepts are often a good choice)
line a:
$\left(0 , - 4\right)$ and $\left(4 , 0\right)$

line b:
$\left(0 , 4\right)$ and $\left(4 , 0\right)$

Draw the two lines using their respective pairs of points
and
note where the lines intersect.