SOLUTION: If a+b=15, a+c=16, and b+c=11, how do you get a b and c on the calculator?

Question 334985: If a+b=15, a+c=16, and b+c=11, how do you get a b and c on the calculator?
Found 2 solutions by stanbon, Edwin McCravy:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
If a+b=15, a+c=16, and b+c=11, how do you get a b and c on the calculator?
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You can't.
Your calculator is a numerical calculator;
it is not a symbolic calculator.
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Cheers,
Stan H.
Answer by Edwin McCravy(20086) (Show Source): You can put this solution on YOUR website!

Write it this way, so that all letters appear in all equations and every letter has a coefficient showing: On you TI-83 or TI-84, Press ON Press CLEAR Press 2nd Press x^-1 (MATRIX) Press right arrow key twice to highlight EDIT Press 1 Press 3 Press ENTER Press 4 Press ENTER Press 1 Press ENTER Press 1 Press ENTER Press 0 Press ENTER Press 15 Press ENTER Press 1 Press ENTER Press 0 Press ENTER Press 1 Press ENTER Press 16 Press ENTER Press 0 Press ENTER Press 1 Press ENTER Press 1 Press ENTER Press 11 Press ENTER Press 2nd Press MODE (QUIT) Press 2nd Press x^-1 (MATRIX) Press right arrow key to highlight MATH Press ALPHA Press APPS You should see rref( Press 2nd Press x^-1 (MATRIX) Press 1 Press ENTER You should see rref([A] [[1 0 0 10] [0 1 0 5 ] [0 0 1 6 ]] The answers are a=10, b=5, c=6 Edwin

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