Please Help PreCalc Problem Let A 2 9 1 5 B 3 2 7 5 C 5 2

Please Help! PreCalc Problem!

Let A = [2 9 1 5], B = [3 2 7 5] C = [5 -2 -7 3] a) Show that A is invertible and Find A^-1. b) Show that B and C are inverses. c) Solve the system using the Cramer\'s Rule: 2x + 9y = 12 x + 5y = 4 d) Compute A + B, A - B, -2A.

Solution

inerse of A

5 -1

-9 2

AND B.C = I

.

.

..

.

.

.

..

.

where I is identity matrix of order 2*2