# math

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

so ....

posted by Reiny
2. 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

posted by carly
3. 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)

posted by Reiny
4. Oh my --- so sorry!!!

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

posted by carly

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