20. Suppose T is the linear transformation given by T to-one? Is T onto? Can you find T-¹? a) T is one-to-one but not onto. b) T is onto but not one-to-one. X1 T2 -5x1 + 9x2 = Is T one- 4x1-7x2 Ꮖ c) T is one-to-one and onto, and T-1 *d) T is one-to-one and onto, and T-¹ ([ 2 ]) = [ -7x1-9x2 -4x1-5x2 7x1 + 9x2 4x1 + 5x2