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pakai matriks
[tex] D \left[\begin{array}{ccc}1&1&-1\\1&2&1\\2&1&1\end{array}\right] =5 Dx \left[\begin{array}{ccc}-3&1&-1\\7&2&1\\4&1&1\end{array}\right] = 10 Dy \left[\begin{array}{ccc}1&-3&-1\\1&7&1\\2&4&1\end{array}\right] = -5 Dz \left[\begin{array}{ccc}1&1&-3\\1&2&4\\2&1&7\end{array}\right] = 20 X=10/5=2 Y=-5/5=-1 Z=20/5=4 (2,-1,4)[/tex]