Question

Which of the following is an example of a function?
A. {(-1, 0), (-1, 3), (3, 9), (5, 10)}
B. {(1, 3), (2, 5), (3, 8), (4, 10)}
C. {(4, 6), (5, 9), (4, 7)}
D. {(0, 2), (0, 3), (1, 5), (4, 5)}

Answer 1

If in a set of points, you see the same x-coordinate used more than once, it is NOT a function.

Answer 2

\(A. {(\color{red}{-1}, 0), (\color{red}{-1}, 3), (3, 9), (5, 10)}\)
\( B. {(1, 3), (2, 5), (3, 8), (4, 10)} \)
\(C. ({\color{red}{4}, 6), (5, 9), (\color{red}{4}, 7)} \)
\(D. {(\color{red}0, 2), (\color{red}0, 3), (1, 5), (4, 5)} \)

Answer 3

oh I get it