Question

Which of the following relations is not a function?

{(0,0),(1,0),(2,0)}
{(1,2),(3,-5),(-1,7)}
{(7,-1),(3,-2),(5,-2)}
{(-1,3)(4,2),(-1,5)}

Answer 1

the last one

Explanation:

because you have two (-1) and that means it is not a function.