02:20duration 2 minutes 20 seconds

Solving a word problem with two unknowns using a…

Solving a word problem with two unknowns using a linear equation.

This shows how to represent the two unknowns using their given relationship so that a linear equation can be written using one variable. Then that equation is solved to answer the question

00:57duration 57 seconds

Simplifying a ratio of multivariate monomials:…

Simplifying a ratio of multivariate monomials: Basic

A quick example of reducing a fraction by dividing matching factors on the top and bottom.