Khan Academy
Khan Academy: Algebra: Basic Rate Problem
This video demonstrates how to solve a word problem by calculating rates. The video uses the formula for distance and isolates the variable "r" for rate. Practice problems available. [4:08]
Khan Academy
Khan Academy: Algebra: Evaluate a Formula Using Substitution
A video that demonstrates how to substitute variables in order to evaluate a formula. The formula is given in the example. [1:15]
Virtual Nerd
Virtual Nerd: Rearrange Formulas to Highlight Quantity of Interest
Choose from three video tutorials that relate to the Common Core standard HSA-CED.A.4. Topics covered include solving a formula for a variable, literal equations, and solving for a variable in terms of another variable.
Khan Academy
Khan Academy: Variables and Expressions: Evaluate a Formula Using Substitution
This video uses the formula for perimeter and asks that the formula is rewritten in terms of width.
Khan Academy
Khan Academy: Algebra: Solving for a Variable
This video demonstrates how to solve for a variable. It uses the formula for the perimeter of a quadrilateral and shows how to solve for the variable l. [1:24]