Khan Academy
Khan Academy: Algebra I: Function Inputs and Outputs: Equation
Find the input that corresponds to a given function output, using the function's formula. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
Khan Academy
Khan Academy: Evaluate Functions
Evaluate functions for specific inputs given the formula of the function. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.