SOLUTION: The following matrix is obtained from the augmented matrix of a system of equations. 1 0 3 20 0 1 2 -2 0 0 1 4 What is the solution to the system is?

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Question 108595: The following matrix is obtained from the augmented matrix of a system of equations.

1 0 3 20
0 1 2 -2
0 0 1 4
What is the solution to the system is?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
1 0 3 20
0 1 2 -2
0 0 1 4
What is the solution to the system is?
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Assuming the variables are a, b, c,
The 3rd line implies that c = 4
If c=4 the 2nd line implies b+2c=-2; b+8=-2; b=-10
If c=4 and b=-10 the 1st line implies a + 3c = 20; a+12=20; a=8
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Cheers,
Stan H.