Question

Help please. Will medal and fan. :)

Which function has an inverse that is also a function?
a) {(–1, –2), (0, 4), (1, 3), (5, 14), (7, 4)}
b) {(–1, 2), (0, 4), (1, 5), (5, 4), (7, 2)}
c) {(–1, 3), (0, 4), (1, 14), (5, 6), (7, 2)}
d) {(–1, 4), (0, 4), (1, 2), (5, 3), (7, 1)}

Answer 1

the one where there is no repeats in the second coordinate
for example, it is not A {(–1, –2), (0, 4), (1, 3), (5, 14), (7, 4)} because of the repeated 4 's

Answer 2

Ohhh, okay. Thank you. :)

Answer 3

yw