5th Solving the problem using Cramer's Rule

I am showing you many ways to solve the same word problem.  In this post we will use Cramer's Rule to solve it.  This is my favorite way to solve 2x2s.

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.