Identifying Functions

A relation is a rule that describes a relationship between two variables. It can be represented in various ways: verbally, as a set of ordered pairs, as an equation, or as a graph on a coordinate plane. A function is a particular kind of relation. This lecture series discusses how to recognize functions when they are given by different representations. Watch the videos and complete the interactive exercises.

Evaluate functions - Questions

1. Find the output, g, when the input, r, is 3.

g=-5 r+13


2. Find the output, b, when the input, a, is 6.

b=-1-7 a


3. Find the output, y, when the input, x, is 5.

y=5 x-3


4. Find the output, k, when the input, t, is -7.

k=10 t-19