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Solving
Linear Equations Using Matrices
Solving Systems
Algebraically
Solving Systems
by Substitution
6:50
Khan Academy
Sal Khan
Khan Academy
Given a system of 3 linear equations with 3 variables, we can represent it with the equation Ax=b, where A is a 3x3 matrix, x is a 3D vector with the variables, and b is a constant 3D vector. Why is this useful? We can solve the system by solving the equation, which in many cases is much more efficient.
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