1. ## Another Systems Problem

This shouldn't be as hard as the last Quadratic, but it's still confusing.

4x^2 + y^2 = 20 and y = 4x

So,
4x^2 + 4x = 20
4x^2 + 4x - 20 = 0

How do I get it factored or simplified?

2. It should be $4x^2 + 16x^2 = 20$.

So $x^2 = 1 \Rightarrow x = \pm 1$.

3. That doesn't seem right. It should turn out as two sets of coordinate solutions. It's supposed to be a quadratic system that you have to solve.

4. Plug in the values. You should get $(1,4)$ and $(-1,-4)$.