Identity equations are equations that are true no matter what value is plugged in for the variable. Learn all about identity equations by watching this tutorial. [4:10]

Use substitution and elimination to solve a system of nonlinear equations with variables. Assess learning with a quiz.

Basketball player Elton Brand describes how he became an NBA star, then presents a challenge about the math behind the perfect free throw shot.

Depending on whether and how the linear equations in a system touch each other, there will be a different number of solutions to the system. There can be one solution, no solution, and even infinite solution. Watch this video for...