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Systems Of Linear Equations Assignment Help

Introduction to the System of linear equation

A linear equation in variables x1, x2, x3, xn is an equation of form a1 x1+ a2 x2+........... + anxn =b

Where a1, a2, and b are constant real or complex number. A system of linear equations is a finite collection of linear equations involving the same set of variables.

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For example,




Solution: x=1,



General form for system of linear equations:

Vector equation: One extremely helpful view is that each unknown is a weight for a column vector in a linear combination.

vector equation

Matrix equation: The vector equation is equivalent to a matrix equation of the form

Ax = b

Where A is an mn matrix, x is a column vector with n entries and b is a column vector with m entries.

matrix equation

The number of vectors in a basis for the span is now expressed as the rank of the matrix.

Properties of System of linear Equation:

  • Independence
  • Consistency
  • Equivalence
Systems Of Linear Equations

The four expressions of a linear system:

1.A general system of linear equations can be written a

a11x1 + a12x2 + ...... + a1nxn = b1

a21x1 + a22x2 + ......... + a2nxn = b1

am1x1 + am2x2 + ...... + amnxn = bm

The vector equation form: x1a1 + x2a2 + + xnan = b;

3. The matrix equation form: Ax = b

4. The augmented matrix form: [a1, a2......., an | b]

Several algorithms for solving a linear equation:

  • Describing the solution
  • Elimination of variables
  • Row reduction
  • Cramer's rule
  • Matrix solution
  • Other methods
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