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Question 67773: PLEASE HELP ME ANSWER THIS QUESTION,I'M GOING TO TAKE A TEST ON THURSDAY ON PROBLEMS SIMILAR TO THIS ONE AND I DON'T GET IT!!!
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.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 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.
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