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?
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It should be $\displaystyle 4x^2 + 16x^2 = 20 $. So $\displaystyle x^2 = 1 \Rightarrow x = \pm 1 $.
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.
Plug in the values. You should get $\displaystyle (1,4) $ and $\displaystyle (-1,-4) $.
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