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Math Help - Family of graphs

  1. #1
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    Family of graphs

    Explain why the graphs of y = -2x + 3 and y = 2x + 3 are a family of graphs.

    My answer is:

    They are a family because they have the same slope.

    Let me know if I'm right or wrong?
    Last edited by Math Help; June 25th 2005 at 06:34 PM.
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  2. #2
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    Wrong.

    One is +2 and another is -2.
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  3. #3
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    Okay thanks.

    They are a family because they have the same y-intercept.
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