One-to-One Functions

One-to-one functions come up in section 11.1. A one-to-one function is a function where each x-value corresponds to only one y-value, and each y-value corresponds to only one x-value.

An example of this is:

a. (1,2), (3,8), (9,0)

This IS a one-to-one function because each x and y-value only appears once throughout the ordered pairs.

b. (4,7), (8,6), (4,3)

This IS NOT a one-to-one function because the 4 shows up throughout the ordered pairs twice as the x-value.