Subject: matrices

Right now, we are dealing with matrices and we are supposed to solve the following problem on our graphing-calculators:

I am a student.

I think that what you are expected to do is to write the system of equations as a matrix equation. Let

Then your system of equations can be written

To solve this matrix equation you can multiply both sides, on the left, by A^-1. That is

But A^-1 A is the 4-by-4 identity matrix I and I X = X so

Using your calculator, construct A and B, compute A^-1 and multiply to get A^-1B.