Question 992354
A) 2 3.5 3 1200
B) 3 2.5 2 1150 
C) 4  3  2 1400
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Subtract A from B and put that in row A
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A  1  -1  -1  -50
B  2  3.5  3  1200
C  4   3   2  1400
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Subtract 2*A from B ; Subtract 4*A from C
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A  1  -1  -1  -50
B  0  5.5  5  1300
C  0   7   6  1600
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Subtract B from C to get::
A 1  -1  -1  -50
B 0  5.5  5  1300
C 0  1.5  1   300
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Subtract 5*C from B ; Add C to A to get:
A 1  0.5  0  250
B 0  -2   0  -200
C 0  1.5  1  300
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Solve row B for "Y"::
Y = 100
Solve row A for "X"
X + 50 = 250
X = 200
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Solve for C for Z::
1.5*100 + C = 300
C = 150
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Cheers,
Stan H.
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Note:: These answers are correct.