Question

R=( − 2 , 2 ) , ( 2 , − 2 ) , ( − 4 , 4 ) , ( 4 , − 4 ) is r a function?

Answer 1

Explanation:

The four inputs (x-coordinates) are {-2, 2, -4, 4}. No input appears more than once. Therefore this seet of points represents a function.