Question 387684: Solve the following proportion for u:
10/u = -5/u - 3
Found 2 solutions by rfer, rapaljer:
Answer by rfer(16322)   (Show Source):
Answer by rapaljer(4671)  (Show Source):
You can put this solution on YOUR website! 
Subtract 10u from each side:
Divide both sides by -15:
It might be a good idea to CHECK this answer, since the first time I worked it, I had an ERROR that I needed to go back and correct! So, substitute u=2 in the original equation:
 IT CHECKS!!
For additional help with RATIO AND PROPORTION, please take a look at my own website. To see it click on my tutor name "rapaljer" anywhere in algebra.com. Look for the link to my website there. From my Homepage, look for the link "Basic, Intermediate, and College Algebra: One Step at a Time", click on "Intermediate Algebra," and then "Chapter 2." Look in "Section 2.09".
See also the solutions of many of these exercises in the "MATH IN LIVING COLOR" pages, where the problems are solved in COLOR. My own students and others have been unanimous in telling me that my own explanations are easier to understand than the expensive textbooks that are written for mathematicians and publishers!! MY EXPLANATIONS WERE WRITTEN FOR STUDENTS WHO HAVE A HARD TIME UNDERSTANDING MATH!! And they are all FREE!!
There is also a FREE video from my classes a few years before I retired. From my Homepage, look for the link "Rapalje Videos in Living Color." Choose "Intermediate Algebra" and look for the video "Fractional and Literal Equations." You can select the portion of the video that you want to see. Choose the part called "Ratio and Proportion." You will need RealPlayer. If you do not already have this program on your computer, it is a FREE download.
I hope you like my website!!! If you do, please recommend it to your family and friends!! At least check out the JOKE PAGE--all safe jokes for the little ears in your family!!
Merry Christmas!!!!!
Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus
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