Question

Which relation is a function?

{(5, 0), (–8, –5), (–8, 5), (–5, –8)}
{(5, 0,) (–8, –5)}
{(5, 0), (0, 5), (–5, –5)}
{(5, 0), (0, –8), (5, –5)}

Answer 1

B. C.

Explanation:

when you have a function, you can only have one input for every output, like in A

{(5, 0), (-8, -5), (-8, 5), (-5, -8)}

we have -8 twice in the sets of numbers on the X, so this set is NOT a function

another way to tell is to plot out the points on the graph, then draw a vertical line and run across the sets, if more then one point cross the line at a time, then those points are not a function, this is called a vertical line test

hope this helps, it looks like a multiple choice maybe, bc B. and C. are both functions from what i can see, i hope this was worth the points u spent on this question

take care :)

Answer 2

B, C

Explanation: