Khan Academy: Testing if a Relationship Is a Function

This short video looks at different points on a coordinate plane and answers a question about whether these points could represent a function. The answer is determined by looking at each point individually to determine whether, given a...

In this exercise, students practice testing solutions of inequalities. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.

Learn about to solve equations by testing solutions to see if they make the equations true in this video. [3:44]

A solution to an inequality makes that inequality true. Learn how to test if a certain value of a variable makes an inequality true. [5:10]

The student is expected to gather and record data & use data sets to determine functional relationships between quantities.

How does the vertical line test help you decide if the graph of an equation is a function? The instructor draws a graph and then draws the line of the equation. She demonstrates how to use the vertical line test to determine if the graph...

Practice plugging in values to equations and checking to see if the equations hold true. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Practice plugging in values to inequalities and checking to see if the inequalities hold true. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

A function means that every element of the domain is paired with exactly one element in the range. The teacher illustrates this by using a table for the given set of numbers.

A function means that every element of the domain is paired with exactly one element in the range. The teacher illustrates this by using a table for the given set of numbers.