InversesofMatrices Part A and B

I I I Suppose that A = [ F] and B = [n J . for some real numbers r and y. Find all ordered pairs (1', y) such that AB = BA. 3" '3 3 (Enter your answer as a list of ordered pairs. for example' (1,2), (3.4], [5,61 .] Answer I I The matrix -6 3 is invertible if and only if k *