Hello, Amanda!
We have: . .[1](b) Write the system: . . in matrix form: .
Use the inverse matrix method to solve the system for and .
I assume we are to find the inverse of matrix . . . ack!
We have: .
. .
. .
. .
Hence: .
Left-multiply both sides of [1] by
. .
. .
. .
Therefore: .
. . (I need a nap!)
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Any other method (Elimination, Substitution, Cramer's Rule,
. . Augmented Matrix) would have been much shorter.