Question

8. Which of the following relations is a function?
A. (7, 1), (-3, 4), (4, 1), (7, 2)

B. (4, 4), (-3, 2), (7, 1), (-7, 2)

C. (4, 4), (-3, 6), (4, 3), (-7, 2)

D. (4, 0), (-3, 3), (7, 1), (-3, 5)

Answer 1

A function maps all possible x values in the domain, to one y value in the range.

So in other words
(x,y), you can't have the same value in two of the x spots in the above 4 points.

Answer 2

For example, A is not a function because,
(7,1) and (7,2) have the same x value which corresponds to two different Y values

Answer 3

So what are you thinking?

Answer 4

B