Question

do these points show a function?

{(0,20), (2,70), (10,45), (1,30), (3,70)}

Answer 1

Yes, these points do represent a function. In a function, each input value (x-value) is associated with exactly one output value (y-value). In the given points, each x-value is associated with a unique y-value, which indicates that it is a function.