Finding a corresponding Matrix

[CBM]

For this questions I know that [1, 1] * [?, ?] = [-1. 3] and [1. -1]*[?,?] = [-3,7] but I am confused how to go about finding a corresponding matrix that works for both of them.

 

[Harry_the_cat]

See the response by Debsta on the MHF site where you have also posted this question.