What's the Slope?
Define a function.
Each input (x-value) has one and only one output (y-value)
Point T (2,-8) is located in which quadrant.
What is Quadrant IV?
Does the table shown describe a function?

Yes, each input has one and only one output.
Does the table shown describe a function?

No, it is not a function because the input is repeated.
TWO PARTER:
Is the following line a function?
What test can you use to prove your answer?
Not a function; The Vertical Line Test