Question

Determine whether or not they are functions or not. please do all 6 if you can?

Answer 1

A function is a relation in which each input has only one output. When we consider a set of ordered pairs, a function does not have two similar values for x. That is for example, {(2,1) , (2,3)} is not a function where as, {(1,3), (2,3)} is a function.

Therefore from the given sets,

`\mleft\lbrace(0,4\mright),(4,-2),(-5,-2),(1,9)\}`

is a function.