In this lesson we are going to take a look at applications of rational equations. When working on a word problem the unknown could end up in the denominator. These often lead to rational expression. Some of the examples you will see involve just numbers, and the other ones involve motion, and work. The last one is going to be a little bit trickier to think about, but once you get the process done you will see that the work problems are not so bad. You'll learn how you can figure out how much of a job has been completed at any given time.
When working on a word problem the unknown could end up in the denominator. These often lead to rational expression.
Some common word problems that lead to rational expressions are ones that involve motion or work.
If a job can be completed in t units of time, then the rate of work is given by 1/t.
By multiplying the rate by the amount of time, we can figure out how much of a job has been completed at any given time.
From working with motion we know that distance = rate x time. This leads to other equations such as rate = distance/time and time = distance/rate
Applications of Rational Expressions
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.