Simplifying both sides to get:

a
2
+
2
a
b
+
b
2
=
c
2
+
2
a
b

Erinn wrote the equation –5x + 4y = 32 to represent her hourly wage (y) and how this wage has changed during each year that she worked at a company (x). what is the rate of change in erinn's hourly wage per year?