math

posted by carly

I have an equation of P=(170-3x)(x-25)

How do I determine the y-intercept

I know I can determine the x intercepts by setting x = to zero, so those are easy to find, but I'm not sure how to find the y-intercept.

Thank you.

  1. Reiny

    no,
    you find the x-intercept by letting y equal to zero, and
    you find the intercept by letting x equal to zero.

    so ....

  2. carly

    Yes, sorry, that's what I meant to say.

    So I find the x intercepts by saying
    170 - 3x = 0 and solving and
    x - 25 = 0 and solving.
    I found those to be
    (25, 0) and (56.67, 0)

    But if I set x equal to zero here, the x intercept will be (0,0)

    I have the solution as (0, -4250) but I don't see how to get that

  3. Reiny

    P=(170-3x)(x-25)
    so if x = 0 , we have
    P = (170-0)(0-25)
    = 170(-25)
    = - 4250

    so the point is (0, -4250)

    well, how about that?

  4. carly

    Oh my --- so sorry!!!

    Yes - thank you!! Please call it the Sunday blues.....

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