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Math Help - Another Systems Problem

  1. #1
    Junior Member
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    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?
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  2. #2
    Senior Member tukeywilliams's Avatar
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    It should be  4x^2 + 16x^2 = 20 .

    So  x^2 = 1 \Rightarrow x = \pm 1 .
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  3. #3
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    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.
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  4. #4
    Senior Member tukeywilliams's Avatar
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    Plug in the values. You should get  (1,4) and  (-1,-4) .
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