4th Solving the problem using gaussian elimination (also called row reduction)

  I am showing you many ways to solve the same word problem.  In this post we will use gaussian elimination (also called row reduction) to solve it.

Here is the word problem:

You and some friends are going to the movies.  They charge $9 for adults and $7 for children.  The movie theatre had 100 customers and made $790 that night.  How many of each type of ticket did they sell?

First, when working on a word problem you should ALWAYS do a setup. In this setup you explain what the variables that you are using stand for.

We will use x for the number of students and y for the number of adults.

Please watch the video to see how to do it.