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Student[LinearAlgebra][BackwardSubstitute] - solve A . x = b where A is in upper row echelon form
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Calling Sequence
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BackwardSubstitute(A, b, options)
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Description
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The BackwardSubstitute(A, b) command, where A is an upper row echelon Matrix and b is a Vector, returns a solution to the equation  .
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If b is not included in the calling sequence, A is assumed to be an augmented Matrix.
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Examples
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![with(Student[LinearAlgebra])](/support/helpjp/helpview.aspx?si=4377/file04968/math84.png)
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![M := Matrix([[2, 4, 0], [4, -2, 2], [-1, -2, 5]])](/support/helpjp/helpview.aspx?si=4377/file04968/math91.png)
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![A := Matrix([[2, 4, 0], [0, -10, 2], [0, 0, 5]])](/support/helpjp/helpview.aspx?si=4377/file04968/math98.png)
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](/support/helpjp/helpview.aspx?si=4377/file04968/math105.png)
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![M := Matrix([[2, 3, -1], [0, 0, 3]])](/support/helpjp/helpview.aspx?si=4377/file04968/math112.png)
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![A := Matrix([[2, 3, -1, 4], [0, 0, 3, 1]])](/support/helpjp/helpview.aspx?si=4377/file04968/math119.png)
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*_t0[1]], [_t0[1]], [1/3]])](/support/helpjp/helpview.aspx?si=4377/file04968/math126.png)
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