Question 4938
The inverse of a function simply means to interchange the x and the y.  In this case, instead of { (12,0), (10,9), (9, 10) } interchange the x and y to get { (0, 12), (9, 10), (10, 9) }, and ask yourself, "Is this a function?"  In other words, does each x value have a unique y value, or is there some value of x for which there are two y values?  In this case, each x value has a unique y value, so this inverse IS a function.


By thw way, an example that is NOT a function would be like { (0, 12) (0, 10), (4, 2) } 


In summary, the inverse is { (0, 12), (9, 10), (10, 9) }.


R^2 at SCC