Question

Please check & help.

I'm starting to get the hang of functions (I think) and would like to know if the first two are correct. If possible could I get some assistance with the bottom 2 as well, please?

Answer 1

Hello!

A function is a set of points where each x value is only associated with one y value. Note that a y value can be associated with multiple x values.

Therefore, your first two answers are correct. You can look at the points, and see that there is no repeat of the x value, so therefore they are functions.

Relation 3: There are two values associated with the domain value of w - w and s. This means that relation 3 is not a function.

Relation 4: There are two values associated with the domain value of r - -2 and -8. This means that relation 4 is not a function.

Hope this helps!