03:31
Practical Problem: The Amount of Weight a Shelf Can Hold
The amount of weight a shelf can hold varies with the length, width, and thickness of the board. Finding how much weight a specific board can hold combines direct, joint, and inverse variation and is illustrated here.
01:21
Joint Variation
Joint variation is when the constant of variation applies to two values. The interest paid on a loan, for examples, varies jointly with the interest rate and the amount borrowed.