7) Let A = 1 -3 2 -2 5 -1 3 -4 -7 and b = b1 b2 b3 . Determine if the equation Ax = b is consistent for all possible b1, b2, b3. If the equation is not consistent for all possible b1, b2, b3, give a description of the set of all b for which the equation is consistent (i.e., a condition which must be satisfied by b1, b2, b3). 7) A) Equation is consistent for all b1, b2, b3 satisfying 7b1 + 5b2 + b3 = 0. B) Equation is consistent for all b1, b2, b3 satisfying -3b1 + b3 = 0. C) Equation is consistent for all b1, b2, b3 satisfying 2b1 + b2 = 0. D) Equation is consistent for all possible b1, b2, b3.