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Math Help - equation solving

  1. #1
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    equation solving

    y + x^2 = 4x
    y + 4x = 16

    Hello, can someone please confirm which of my following answers would be the correct way to solve this problem.

    i)
    x = 4, y=0

    ii)
    x^2-8x+16=0
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  2. #2
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    e^(i*pi)'s Avatar
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    Equation ii is fine and (4,0) is the only pair of solutions so if i) is your answer then it's correct
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  3. #3
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    x^2 - 8x + 16 factors into (x-4)^2, so i) and ii) would both work. =)
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  4. #4
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    However, as an answer to the problem, only x= 4, y= 0 is correct.

    The equation x^2- 8x+ 16= 0 is a step on the way to finding the solution.
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