## mm3591 one year ago Which of the following lists of ordered pairs is a function? A. (4, 2), (4, -2), (9, 3), (16, 4) B. (9, 4), (5, 0), (1, -4), (-2, -6) C. (1, 2), (0, 3), (1, 4), (6, 5) D. (9, 4), (5, 0), (5, 3), (-2, -6)

1. Mertsj

A function is a set of ordered pairs in which no two ordered pairs have the same first number.

2. jdoe0001

the set that has no X-Repeats let's take a look at the 1st one, does it have a x-coordinate repeat? $$\bf A.\qquad ({\color{red}{ 4}}, 2), ({\color{red}{ 4}}, -2), (9, 3), (16, 4)$$ low and behold, it does, thus is NOT a function check the others