Question 62723
determine if the function  {13,0}, {10,-9}, {9,-10}, is invertible and what is its inverse.  
If none of the x's match each other, it's a function.  If none of the y's match either, it's invertible.
It's inverse involves switching the x's and y's.
{0,13}, {-9,10}, {-10,9}
Happy Calculating!!!