If (-3, 1) is the point of the function, then the point of the inverse function would be (1, -3).
Firstly, the notation being used above with the negative 1 denotes that it is an inverse function. Secondly, all inverse functions are just the ordered pairs of the original function in reverse. So, since we had -3 for x and 1 for y, we change it to 1 for x and -3 for y.