In this equation, there is nothing to solve for. However, the expression

is the Pythagorean theorem. If there is a right triangle, then when the lengths of two shorter legs (a and b) are added together, and then square rooted, you get c, which is the hypotenuse.
Hope this helps!
Divide 6 by -1. Remember that -y is really -1y.
The dimensions of the pool are 67ft in length and 32 feet in width