# 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)

4. carly

Oh my --- so sorry!!!

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

## Similar Questions

1. ### algebra

y=2x^2+5x-3 a)determine the x-intercepts b)determine the vertex c)determine the axis of symmetry d)determine the maximum or minimum value, stating whether it is a maximum or a minimum e)determine the range can i get the equations so …

5. Find the x and y intercepts of each linear equation. Be sure to write your answers as ordered pairs. a.y=3x-6 b.6y=-x+2 Set x = 0 and y = 0 to find the intercepts. will that get me 2 thingys for each.?
3. ### algebra

I trust you know about y = mx + b Realize that when you are given the x or y intercepts, you are really just given two points, in your case the points (4,0) and (0,-2) So it is easy to find the slope, (-2-0)/(0-4) = 1/2 Take it from …
4. ### Mathematics

Determine the equation of a quadratic function that satisfies each set of conditions. a) x-intercepts 1 and -1, y-intercept 3 b) x-intercept 3, and passing through the point (1, -2) c) x-intercepts -1/2 and 2, y-intercept 4 Please …
5. ### College Algebra

Using the 7 steps outlined in section 4.3 of your book, analyze the graph of the following function: R(x) = x^2 - 49/x^4 - 16 Step 1: Factor the numerator and denominator of R and find its domain. If 0 is in the domain, find y-intercept, …
6. ### math pre calculus

find the following for the function f(x)=(x+5)^2(x-2)^2 a.find the x and y intercepts, b.find the power function that the graph ressembles for large values of x c.determine the maximum number of turning points on the graph of f d.determine …
7. ### Pre-Calculus Questions

Hi! Can someone help me with these? Thanks! 1.) Determine the slope and the y-intercept of the equation of the line passing through the points (-5, 3) and (1, -3). Write the equation of the line in slope intercept form. 2.) Determine
8. ### Math

For each function, i) determine the corresponding reciprocal function, y =1/f(x) ii) state the non-permissible values of x and the equation(s) of the vertical asymptote(s) of the reciprocal function iii) determine the x-intercepts …