HELP ME PLEASE!!

Which relation is a function?

a. {(5,3),(2,8),(-5,-1),(4,7),(3,1)}
b. {(5,3),(2,8),(-5,-1),(4,7),(5,7)}
c. {(-5,3),(2,8),(-5,-1),(4,7),(2,2)}
d. {(5,3),(2,8),(-5,-1),(4,7),(2,1)}

Question

HELP ME PLEASE!!

Which relation is a function?

a. {(5,3),(2,8),(-5,-1),(4,7),(3,1)}
b. {(5,3),(2,8),(-5,-1),(4,7),(5,7)}
c. {(-5,3),(2,8),(-5,-1),(4,7),(2,2)}
d. {(5,3),(2,8),(-5,-1),(4,7),(2,1)}

anonymous · Answer

stop spamming the question list and wait for an answer.

anonymous · Answer

Well no one is giving me an answer & I need one cause I can't figure it out.

anonymous · Answer

it is a function if all the x values of the coordinates are unique.

anonymous · Answer

so look at the x coords of each choice and see which doesn't have repeats:
a. 5,2,-5,4,3
b. 5,2,-5,4,5
c. -5,2,-5,4,2
d. 5,2,-5,4,2