y=5x
y=4x+9
Just set the y's equal
5x = 4x + 9
5x - 4x = 9
x = 9
Whats Y?
Plug x into one of the equations
y = 5(9) = 45
FOR X: write 5x in terms of y, add -4x to both sides to get x=9
FOR Y: substitute 9 -> y=5x to get y=45
+267 
