Which relation is a function?
{(1, 2); (3, 2); (3, 3); (4, 2)}
{(1, 2); (2, 3); (3, 4); (2, 5)}
{(1, 2); (1, 3); (1, 4); (1, 5)} {
(1, 2); (2, 3); (3, 4); (4, 5)}

A relation is a function if & only if for each value of x we have (at the most) one & only one value of y.
In short if we have a repeat value of x that correspond to 2 different values of y then it's not a function but a relation instead

Let's take the 1st example:
    x     I   y
I
1        I  2
3        I  2
3        I  3
4        I  2
We notice that there are 2 SAME VALUE of x (that is 3) that have various value of y, Hence this is not a function. Mind you this concerns x ONLY.
In short a function doesn't allow a repeat of same x.
Follow this methodology & you will find the other problems

A’b’c’ are the coordinates to the new location of the transformed triangle abc. find the distance between the coordinates points to use for your calculations.

Your maths is very weak try yourself this would improve your skills don't depend on others