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Representing systems of any number of equations with matrices | Precalculus | Khan Academy
Author: Khan Academy via YouTube
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In a previous videos, we saw how to represent a system with 3 equations and variables as a single matrix equation. It turns out we can do the same for a system of n equations and variables. The resulting equation will be Ax=b, where A is an nXn matrix, x is an nX1 unknown vector, and b is the nX1 constant vector.