Posted by Allan on .
Find the inverses of the matrices.
Let A = 1 2
5 12
b1 = 1
3
b2 = 1
5
b3 = 2
6
b4 = 3
5
Find A^1, and use it to solve the four equations.
Ax = b1, Ax = b2, Ax = b3, Ax = b4

Math Linear Algebra 
Steve,
Only A has an inverse. Only square matrices have inverses. A^1 =
6 1
5/2 1/2
Now just plug it in