MATH PROBLEM! can someone tell me which is a function and which is not?

draw a vertical line if it crosses more than 1 point

only 3 &5 are function graphs...................ie. y = f(x)....#2,5 , 6 are functions x = g(y)

the ones with two different answers generally are suspect .

y = f at x can only have one answer generally

so the first one is NOT A FUNCTION because it has two overlapping sections

im thinking the last one on the right bottom is not too because two points on the Y AXIS ..

the rest are legit .. the line is legit the circle legit

the v type shape i think is a function its a result of absolute value function

the third one dots i am not sure of that one i thin its a function but may be incoorect

Draw a vertical line. If it crosses more than 1 point, then you're not dealing with a function

NNYNYY