Question

http://prntscr.com/68my3r

@SolomonZelman @iambatman @Nnesha @undeadknight26 @eliassaab

Answer 1

Try using the Vertical line test.

Answer 2

do vertical line test if the shape touch the line at two point then ithat's not a function

Answer 3

for example this is ur question

Answer 4

if i check by doing vertical line test u can see there is two point where line cross the circle thats mean that is not a function