Whenever I see an expression like this, f(x)=-5x+6, how do I know if it is a function? Thank you.

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asked by Helene
  1. A function crosses a vertical line only once. For example, if you sketched
    a y parobla which opens upward or downward; a vertical line would cross it at only one point. Therefore the y parabola is a functin.

    If you drew an x-parabola and drew a
    vertical line through it, The line
    would intersect it twice. Therefore, an x-parabola is NOT a function.
    An x-parabola opens to the left or right.

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    posted by Henry

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