The product of a matrix times a vector is defined, and used to show that a system of linear equations is equivalent to a system of linear equations involving matrices and vectors. The example uses a 2x3 system.

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##### Definition of matrix-scalar multiplication math.la.d.mat.scalar.mult

##### A linear system is equivalent to a vector equation. math.la.t.linsys.vec

##### A matrix equation is equivalent to a linear system math.la.t.mat.eqn.linsys