Khan Academy
Khan Academy: Equations and Inequalities Word Problems
Construct an equation or an inequality that models a given context. Modeling expressions can be quadratic, rational, or exponential. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video,...
Sophia Learning
Sophia: Writing Equations With a Variable: Lesson 1
This lesson explains how to write out equations in which the variable would be on either side of the equal sign. It is 1 of 6 in the series titled "Writing Equations with a Variable."