Question 67773
   CONSIDER THE SYSTEM OF EQUATIONS.
           9X+3Y+Z=10
          25X+5Y+Z=36
           4X-2Y+Z=15

a) REWRITE THIS SYSTEM AS A MATRIX EQUATION.
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Assuming you have a calculator, enter the 
coefficients of the variables into a 3 x 3
matrix called "A".
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Enter the constants into a 3x1 column matrix
called "B".
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Call A to your homescreen and hit the "invert" 
button.
Call B to your homescreen to the right of A^-1
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Multiply A^-1 B to get the solution 3/1 column
matrix. 
I get: X=6, Y=-35, Z=61
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Cheers,
Stan H.