Solve the system.
x1 - 5x2 + 4x3 = -3
2x1 - 7x2 + 3x3 = -2
-2x1 + x2 + 7x3 = -1

Solve the system.
x1 - 5x2 + 4x3 = -3
2x1 - 7x2 + 3x3 = -2
-2x1 + x2 + 7x3 = -1

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I know that we are to end up with a matrices in the form of
1 ? ? ?
0 1 ? ?
0 0 1 ?

@LadyInkblot have you converted the system to a matrix yet?

Yes.
It starts out as a matrix of
1 -5 4 -3
2 -7 3 -2
-2 1 7 -1

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