Also, if you can get all the coordinates----> (3,5)
3=x value
5=y value
If the x value ever appears more than once then it's not a function
Example (1,5) (2,6) (3,9) (2,4)
Is that a function?
No, because the x value, 2 appears twice.
Example: (4,5) (2,3) (1,5) (3,7)
Is that a function?
Yes, because non of the x values appear more than once, there for the vertical line test will nvr have 2 intersections
Hope this helps!
