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  • Mrs. Smith I am worried about our math test! I still do not know how to tell when a graph reflects over the x-axis or y-axis
  • Don't worry Cindy it's easy! A graph reflects over the y-axis when the x values are multiplied by -1 and over the x-axis when the entire function is multiplied by -1. For example you can reflect f(x)=x over the x-axis by changing it to f(x)=(-1)(x ) or -(x ). You can reflect it over the y-axis by changing it to f(x)=(-1*x) or (-x).
  • Oh so to graph a reflection over the x-axis you multiply the y value of each point from the parent function by -1 and keep the x values the same to get the points for your new graph. For a reflection over the y-axis you multiply the entire function by -1 which means x values from the parent function will be multiplied by -1 and the y values stay the same for the new graph.
  • Exactly!! You are going to do great on your test!
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