Question

Is the relation a function?(-2,4) (3, 7) (0.8) (5, 8) (1, 6)

Answer 1

For a relation to be a function, each output MUST have one input only.

For this set of ordered pairs, each output has one input except for output 8.

So it is not a function

The inputs 0 and 5 both have the same output which is 8