Math.com
Math.com: Graphing Equations and Inequalities: The Coordinate Plane
The tutorial explains how learners can solve a formula for any of its variables using the rules for solving equations. Notes, examples, and practice problems are included in the resource.
Khan Academy
Khan Academy: Algebra I: Complete Solutions to 2 Variable Equations
Given the x or y value of a 2-variable equation solution, find the value for the other variable in the solution. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
ClassFlow
Class Flow: Applications Using Systems
[Free Registration/Login Required] This flipchart provides guided practice with word problems involving systems of equations and gives a brief review on solving systems of equations.