Which of the following sets of ordered pairs is not a function?

Question

(A) (1,2) (2,3) (3,2)

(B) (1,1) (2,-1) (-1,2) (-2,-2)

(C) (0,0) (3,0) (-3,0)

(D) (1,1) (2,2) (3,3) (2,-1)

(E) None of these

For this I got; (D) (1,1) (2,2) (3,3) (2,-1). Is this the correct answer?

Answer 1

You are correct!! Every x needs EXACTLY 1 y. So if they give you ordered pairs, just look for repeating x's.

Congrats : )