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 .