Select is a function or is not a function to correctly classify each relation. title is a function is not a function
{(2, , , , 8)}
{(0, , , , 4)}
{(1, , , , 3)}
{(3, , , , 3)}

{(2, 2),(4, 4),(6, 6),(8, 8)} Is a function.
{(0, 3),(3, 5),(5, 6),(8, 4)} Is a function.
{(1, 2),(3, 3),(4, 8),(6, 3)} Is a function.
{(3, 4),(5, 2),(5, 6),(7, 3)} Is not a function. 

For a relation to be a function, every x value must have only one y value.

Hope this helps.

the formula of a slope:

we have the points (-2, 7) and (2, 3). substitute:

answer: the slope is equal -1.