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Math Help - i got the wrong y int(p int in this case)

  1. #1
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    i got the wrong y int(p int in this case)

    i'm working pre-algebra on my own so i can take pre-calc and then calc. I am going to post whenever i run into problems. heres one from chap 4, Sec 4.5.

    The book graphs the p intercept as 0 but i get 300. heres the problem.

    15. Graph each formula for the given values of the independent variable.

    P = 40n + 300, 0 ≤ n ≤ 200

    i get the ordered pair as ( n, P ),
    the slope as 40n,
    and the P int as ( 0, 300)

    this concludes me to graph the Y or P int at 300, but the answer at the back of the book graphs at 0 w/ the slope being 40/1. Can someone explain why the P int is at 0 and not at 300.
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  2. #2
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    Auckland, New Zealand
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    If P=40n+300, then when n=0 p=300 so the p intercept is indeed 300 and the slope (gradient) is 40. Looks like your book has a mistake?
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  3. #3
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    o.k. thanks.
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