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Math Help - Y a function of X?

  1. #1
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    Y a function of X?

    Could someone please assist and advise if the following equation determines Y to be a function of X : y2 = x + 3 ? (the 2 is an exponent) Thanks much!
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  2. #2
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    Quote Originally Posted by jay1 View Post
    Could someone please assist and advise if the following equation determines Y to be a function of X : y2 = x + 3 ? (the 2 is an exponent) Thanks much!
    Hi jay1,

    If y^2=x+3, then y=f(x)=\pm \sqrt{x+3}

    f(x)=\pm \sqrt{x+3} is a parabola with vertex on the x-axis and opening to the right. By definition, it is not a function.
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