Can someone plz check this? i'm not sure i got them right.

For a set of coordinate pairs, a function set, will not have a repeat on the x-coordinate, namely, the "x"s do not repeat, no x-repeats.

now, look at 4)    

the x-values are -2, 0, 2, 4, no repeats, so it IS a function.

10)



the other ones, you can check for that, you're correct.  For example for 6), the graph doesn't pass the "vertical line test", so is not a function.