Question

F={(-1,0),(4,2),(-1,2),(2,2)} is f a function and why/why not

Answer 1

No, because x=-1 is assigned to more than one y; those y's are 0 and 2.

Explanation:

A set of points is a function if there is only one y assigned to an x.

A set of points that has an x that gets assigned to more than one y is not a function.

Here we have the latter because x=-1 is assigned to more than one y; those y's that x=-1 is assigned to is 0 and 2. Therefore the set is not a function.

Answer 2

F is not a function

Explanation:

For something to be a function is has to have only 1 X coordinate per each Y coordinate and F has two X coordinates that have 2 as their Y coordinate

I hope this helps and please don't hesitate to ask if there is anything still unclear!