How to inverse a function? Are the sets one-to-one? (i think yes) (number set of one anyways)
{(-7,2) (6,2) (7,11) (4,-2)} -{(2,-7) (2,6) (11,7) (-2,4)} I thiiink that's how it works
{(-13,-20) (-1,22) (4,9) (14,17)}, and i'd do the same with the set here
The set {(-13,-18) (-5,-18) (0,8) (10,19)} I'm sure is not one-to-one, therefore, cannot be inversed (or doesn't have to be for my sake)

Question

How to inverse a function? Are the sets one-to-one? (i think yes) (number set of one anyways) 
{(-7,2) (6,2) (7,11) (4,-2)} ->{(2,-7) (2,6) (11,7) (-2,4)} I thiiink that's how it works
{(-13,-20) (-1,22) (4,9) (14,17)}, and i'd do the same with the set here
The set {(-13,-18) (-5,-18) (0,8) (10,19)} I'm sure is not one-to-one, therefore, cannot be inversed (or doesn't have to be for my sake)

amistre64 · Answer

is the function defined as:

(-7,2) (6,2) (7,11) (4,-2)

??

amistre64 · Answer

if so, -7 and 6 share the 2 .. so that is 2 to 1, not 1 to 1

amistre64 · Answer

a function is one to one if f(a) = f(b) implies that a=b

f(-7) = f(6)  but -7 is not equal to 6