3. find all solutions of the linear congruence 3x - 7y = 11 (mod 13). 4. solve each of the following sets of simultaneous congruences: (a) xel (mod 3), x = 2 (mod 5), x = 3 (mod 7). (b) x = 5 (mod 11), x = 14 (mod 29), x = 15 (mod 31). (c) = 5 (mod 6), x = 4(mod 11), r = 3 (mod 17). (d) 2x = 1 (mod 5), 3x = 9 (mod 6). 4x = 1 (mod 7), 5.x = 9 (mod 11). - 1 connee 73 med 2 3 5 b abestem