It is important in problem solving in mathematics to use an equation to represent a situation and use the equation to solve a meaningful problem.

In this lesson, you will focus on ways to use and interpret equations.

Some equations are presented in standard form *Ax* + *By* = *C* and are usually used for mixture problems.

Other equations are presented in *y* = *mx* + *b* form and are usually used for problems that involve a starting point and a rate of change.

When you know the equation, you can use it to make predictions, solve problems, and interpret solutions.