In computer computations it is often necessary to compare numbers. Two four-bit signed numbers, X = x3x2x120 and Y = 93929190, can be compared by using the subtractor circuit in Figure 5.43, which performs the operation X-Y. The three outputs denote the following: . Z = 1 if the result is 0; otherwise Z = 0 N = 1 if the result is negative; otherwise N = 0 . V = 1 if arithmetic overflow occurs; otherwise V = 0 Show how Z, N, and V can be used to determine the cases X = Y, X Y.