**Question from Valerie:**

Algebra I; Test 4; Problem 13.

I have the answer, but can you explain how you got the answer and give the pages in the textbook that talk about this problem? Thank you!

**Answer from Dr. Callahan:**

The question is asking is the equation is true.

It is NOT true is there are values where it does not work, or at least not true for those value.

So for instance, if you get x= 6 and y =1 — it does NOT work.

Also true for other values. In fact, the only times it DOES work is when x=y.

You will find this kind of thing in chapter 11.

dwc