if x^2 – y^2 = x- y and x<y, what is the average (arithmetic mean) of x and y?

A) 0

B) 1/2

C) 1

D) x/2

E) y/2

Factor:

Now divide by :

The arithmetic mean of 2 numbers is their sum divided by 2. Since you know the sum of *x* and *y* is 1, you know their arithmetic mean is .