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Chapter 2.8!. By: Hannah Murphy. Flashback !. Remember earlier this year you learned the absolute value of x equals x, if x>0 0, if x=0 -x, if x<0 The point on a graph were two rays meet is the vertex!. Graphing Absolute Value .

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Presentation Transcript
By hannah murphy

Chapter 2.8!

By: Hannah Murphy


Flashback
Flashback !

  • Remember earlier this year you learned the absolute value of x equals x, if x>0

    0, if x=0

    -x, if x<0

  • The point on a graph were two rays meet is the vertex!


Graphing absolute value
Graphing Absolute Value

  • In order to graph y= a (x-h) + k you must know the following characteristics

  • The graph has vertex (h,k) and is symmetric in the line x=h

  • The graph is v shaped and opens up if a>0 and down if a<0


Graphing absolute value1
Graphing Absolute Value

  • The graph gets wider if the absolute value of a is less than one, and gets narrower if a is greater than one

  • Graph is wider than y = |x| if a<1

  • Graph is narrower than y = |x| if |a|>1


Writing an equation when the graph is provided
Writing an equation when the graph is provided

  • Start with the equation format:

    y = a|x-h| + k

  • Next find vertex (point at which the graph opens up) – this is (h,k)

  • Now substitute in the vertex (h,k) into the equation


Writing an equation when the graph is provided1
Writing an equation when the graph is provided

  • To find the value of a, substitute the coordinates of a point on the graph into the equation and solve for a

  • Now you have a and you can write the equation


Review
Review

  • Write down the equation format first y=a|x-h| +k

  • If you are graphing, find the vertex first (h,k)

  • Remember that the graph is symmetric in the line x = h

  • These are v shaped and a tells you if it opens up or down depending if > or < 0

  • The width of the graph is determined by a again

  • You may find it helpful to plot the vertex and one other point, use symmetry to plot a 3rd

  • Remember that Absolute Value Functions are absolutely fun!


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