Question

Which as an a function? http://prntscr.com/1ducak

Answer 1

the one that doesn't have repeating x coordinates

Answer 2

you know which are the x coordinates right?

Answer 3

no

Answer 4

for example you have (1,2)

1 is the x coordinate and 2 is the y coordinate

Answer 5

so look at your choices and find the one that doesn't have repeating x coordinates

Answer 6

is it a?

Answer 7

yes

Answer 8

:D!