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9. R1 = {(x, y) |x mod y = 1}; R1 is from X to Y; R2 = {(y,z)ly > z}; R2 is from Y to Z; ordering of X, Y and Z : 1, 2, 3 a. The matrix A1 of the relation R1(relative to the giving ordering). b. The matrix A2 of the relation R2 (relative to the giving ordering). 10. Continue from question 9 above, a. calculate the matrix product A3 = A1 X A2. b. Find R2 . R1 from A3