Question

(1,2) (1,8) (3,6) (4,8) is it a function?

Answer 1

Answer:

No, because the x value of 1 correlates to two different y values.

Step-by-step explanation:

A function is defined by an x value having exactly one corresponding y value. In this case, the x value of 1 corresponds to both the y values of 2 and 8, therefore invalidating it as a function.

Hope this helps!

Answer 2

Answer:

No, this table is not a function.

Step-by-step explanation:

$x: 1, 1, 3, 4\\y: 2, 8, 6, 8$

In the x column, you can see two one's $(1)$. Also, in the y column, you can see two eight's $(8)$.