Question

please help

Answer 1

no, not B
pick the one where the first numbers are all different

Answer 2

B. (3, 5), (4, 7), (5, 4), (5, 6)
not a function because you have 5 twice as a first number

Answer 3

did you understand what i wrote about repeats in the first coordinate?
right, not A

Answer 4

as always, the answer is C
it is always C

Answer 5

yw