Question

Graph the relation shown in the table. Is the relation a function? Why or why not?
(-1,3)
(-1,2)
(0,-4)
(4,2)

Yes; no horizontal line passes through two graphed points.

No; a horizontal line passes through two graphed points.

No; a vertical line passes through two graphed points.

Yes; no vertical line passes through two graphed points.

Answer 1

Since there are multiple points with the same x-coordinate (-1), the relation represented by this table is not a function. Functions can only have one output for each input.