Graph the relation in the table. Then use the vertical-line test. Is the relation a function?

x
y
–1
3
1
–1
2
2
1
3

Question

Graph the relation in the table. Then use the vertical-line test. Is the relation a function?

x
y
–1
3
1
–1
2
2
1
3

anonymous · Answer

Based on your format there, it's hard to tell which inputs are matched with which outputs. However, here's my explanation for testing is something is a function.

If I have an ordered pair like (1,2) it means that the input, 1 has an output of 2. Looking at my list of pairs, two inputs are allowed to have the same output. So I can have the points
(1,2) and (3,2) in the same function.
However, one input is not allowed to have more than one output. So I CAN'T have the points
(1,2) and (1,3) in the same function.