Finding Intercepts

Find the x-intercept for the graph of the following equation.
18x + 12y = 72

Comments for
Finding Intercepts

Average Rating starstarstarstarstar

Click here to add your own comments

Dec 08, 2010
Rating
starstarstarstarstar 		Finding Intercepts
by: Karin

The x-intercept is the point where the line crosses the x-axis. Therefore, this is a point on the x-axis.

All points that are on the x-axis have a y coordinate of 0. OR y = 0

If you don't understand this, read the following web page:

http://www.algebra-class.com/y-intercept.html

Scroll down until you see a graph of examples of x-intercepts.

Since we know that y = 0, we can substitute 0 for y into the equation and solve for x. This will be the x-intercept.

18x + 12y = 72
18x + 12(0) = 72
18x = 72
18x/18 = 72/18
x = 4

The point is (4,0) and the x-intercept is 4.

I hope this helps,
Karin

Click here to add your own comments


Having Trouble with Your Homework?

algebrator

[ ?] Subscribe To This Site

XML RSS
Add to Google
Add to My Yahoo!
Add to My MSN
Add to Newsgator
Subscribe with Bloglines


Enjoy This Site?
Then why not use the button below, to add us to your favorite bookmarking service?

| Homepage | Contact Me | Privacy Policy | Disclaimer |Affiliates



Return to top
Copyright© Algebra-class.com 2009.