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Math Help - line of relection??

  1. #1
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    line of relection??

    hey guys i need your help!!

    In the xy plane the equation of line L y=2x+5. If line m is the reflection of line L in the x axis what equation for m?
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    Quote Originally Posted by fabxx View Post
    hey guys i need your help!!

    In the xy plane the equation of line L y=2x+5. If line m is the reflection of line L in the x axis what equation for m?
    Reflecting a function y = f(x) over the x axis gives a transformation of y \to -y, so your new function will be -y = f(x). Now solve for y.

    So in this case we have y = 2x + 5. Reflecting this over the x axis gives -y = 2x + 5, so the line m will be y = -2x - 5.

    -Dan
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