So we have and . This is just a quadratic equation. If we apply the quadratic formula, we get

Alternatively, you can try completing the square:

If you forgot how to complete the square or solve quadratic equations, you will really need to do some review.

We have two equations with two unknowns. Just solve the system:

Simplify:

Multiply (2) by 2.2:

Add (1) and (3):

Substituting for in (1), we get

Again, if you don't know how to solve systems of linear equations, you will need to review.