Solve an Upper Triangular System

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backsolve(r, x, k=ncol(r))

`r`	an upper triangular matrix giving the coefficients for the system to be solved. Values below the diagonal are ignored.
`x`	a matrix whose columns give ``right-hand sides'' for the equations.
`k`	The number or columns of `r` and rows of `x` to use.

The solution of the triangular system. The result will be a a vector if x is a vector and a matrix if x is a matrix.

Dongarra, J. J., J. R. Bunch, C. B. Moler and G. W. Stewart (1978). LINPACK Users Guide. Philadelphia: SIAM Publications.

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