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August 29, 2015
Posted by **Allan ** on Wednesday, October 5, 2011 at 12:14pm.

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**, Wednesday, October 5, 2011 at 2:24pmOnly A has an inverse. Only square matrices have inverses. A^-1 =

6 -1

-5/2 1/2

Now just plug it in