Graphing+Linear+Functions-Target+B-Is+it+a+Function?-Guided+Learning

Graphing Linear Functions-Target B: Justify whether any given representation is a function.

 * [[image:Discuss this.png width="173" height="97"]] || Imagine that you are going to see your favorite musical performer in concert. When you arrive at the venue, someone is sitting in your seat. Both you and the other party claim to have tickets for the same seat. What would you do? ||

What is a Function? A function is a relation where every x-value is paired with exactly one y-value. Let's take a look at the different representations of functions: @Ordered Pairs @Tables Graphs Context

Function notation: When writing a rule for a function, it should be written using function notation. To write using function notation, change the "y" to "f(x)". When you see "f(x)" it is read as "f of x" or the "function evaluated at x".The "x" in the rule still represents the inputs (domain), and "f(x)" represents the outputs (range).

For example, the rule y = 2x + 1 can be written using function notation: f(x) = 2x + 1. If you go back to Target A of this unit, there is a video showing how to evaluate using function notation, in case you need to review.