6th Solving the problem using Matrix Inverses

 I am showing you many ways to solve the same word problem.  In this post we will use Matrix Inverses to solve it.  I do NOT recommend this way to solve a 2x2.

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.