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Nichelle1012
Junior Member

USA
5 Posts

 Posted - 09/26/2013 :  17:21:59 Find the equation that has intercepts (0, -7) and (3, 0).I don't remember how to do this at all. Please explain how to get the answer instead of just giving the answer. Thanks in advance to everyone who responds. :-)

Ultraglide

299 Posts

 Posted - 09/26/2013 :  19:01:10 I am sure your text shows you how to find the equation of a line given two points. If you don't have a text, just search the net.

Nichelle1012
Junior Member

USA
5 Posts

 Posted - 09/26/2013 :  21:52:02 quote:Originally posted by UltraglideI am sure your text shows you how to find the equation of a line given two points. If you don't have a text, just search the net.Ultraglide, if I had a textbook to show me, I wouldn't have posted the question for help. I'm not in a class; I am just doing sample problems to em refresh my memory. Also, I have searched the web for help. The website that I am seeking help on is www.mathgoodies.com. As for any other sites, I obviously couldn't find what I'm looking for. Thank you so much. Your reply was SO helpful.

the_hill1962

USA
1468 Posts

 Posted - 09/27/2013 :  08:51:14 Intercepts mean where the graph of the equation crosses the axis.An x intercept has a point such as (x,0) because any point that is on the x axis would have a y coordinate of zero.A y intercept has the form (0,y).If you need more explanation at this point, please ask before reading further.In your problem, the x intercept is (3,0) and the y intercept is (0,-7)Hopefully you are familiar with the slope intercept form of a linear equation:y = mx + b where b is the y intercept and m is the slope.So, so far you know the equation will have b=-7 since -7 is the y intercept in your problem.Now to figure out m (the slope).Hopefully you know how to calculate the slope. If not, look up the formula or ask us. The slope for your points is (-7-0)/(0-3) and that is the fraction 7/3.So, you can now write the equationy = (7/3)x - 7

Nichelle1012
Junior Member

USA
5 Posts

 Posted - 09/27/2013 :  11:46:18 quote:Originally posted by the_hill1962Intercepts mean where the graph of the equation crosses the axis.An x intercept has a point such as (x,0) because any point that is on the x axis would have a y coordinate of zero.A y intercept has the form (0,y).If you need more explanation at this point, please ask before reading further.In your problem, the x intercept is (3,0) and the y intercept is (0,-7)Hopefully you are familiar with the slope intercept form of a linear equation:y = mx + b where b is the y intercept and m is the slope.So, so far you know the equation will have b=-7 since -7 is the y intercept in your problem.Now to figure out m (the slope).Hopefully you know how to calculate the slope. If not, look up the formula or ask us. The slope for your points is (-7-0)/(0-3) and that is the fraction 7/3.So, you can now write the equationy = (7/3)x - 7the_hill1962, thanks!! I do know how to calculate the slope. I got as far as y=(7/3)x-7, but got stuck as to what to do from there. Now I know that you cancel out the (7/3)x and add it to y, which gives (-7/3)x+y=-7. Then I multiply everything by 3, which then gives me the final solution of -7x+3y=-21. Once again, thanks. :-)
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