How to Solve Simultaneous Linear Equations Using Matrix Methods
Here is how to solve a system of n linear equations in n unknowns, using matrix methods.
Express the set of n linear equations compactly in matrix form.
Ax = y
Premultiply both sides of the equation by A-1, the inverse of A.
A-1Ax = A-1y
Since A-1Ax = Ix = x, we know the following.
x = A-1y
Thus, as long as the inverse A-1 exists, we can solve for x, the vector of unknown values. If the inverse does not exist, the set of equations does not have a unique solution.
How to Solve Simultaneous Linear Equations Using Matrix MethodsHere is how to solve a system of n linear equations in n unknowns, using matrix methods.Express the set of n linear equations compactly in matrix form.Ax = yPremultiply both sides of the equation by A-1, the inverse of A.A-1Ax = A-1ySince A-1Ax = Ix = x, we know the following.x = A-1yThus, as long as the inverse A-1 exists, we can solve for x, the vector of unknown values. If the inverse does not exist, the set of equations does not have a unique solution.
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