Khan Academy
Khan Academy: Algebra: Linear Equations in Standard Form
This video demonstrates how to take linear equations written in either slope-intercept form or point-slope form and rewrite them in standard form of a linear equation. Right-click on the square at the bottom right for a full-screen view....
Sophia Learning
Sophia: Adding and Subtracting of Rational Expressions
Learn how to add and subtract rational expressions with this video tutorial.