9th class science group Math Ch no .1 Exercise no 1.6 Question no .1 part( i, ii) complete.....

9th class science group Math Ch no .1 Exercise no 1.6 Question no.1part (i,ii)........
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The Crammer rule is a fundamental principle in linear algebra and matrix theory. It is named after the Swiss mathematician Gabriel Crammer.
Statement of the Rule
The Crammer rule states: "If a matrix A has an inverse, then the system of linear equations Ax = b has a unique solution, given by x = A^-1 b."
Explanation
The rule provides a method to solve systems of linear equations using matrix inversion. It states that if the coefficient matrix A has an inverse (denoted by A^-1), then the solution to the system can be found by multiplying the inverse matrix by the constant vector b.
Mathematical Derivation
Let's consider a system of linear equations:
Ax = b
Where A is an n x n matrix, x is an n x 1 vector, and b is an n x 1 vector.
If A has an inverse, then we can multiply both sides of the equation by A^-1:
A^-1 Ax = A^-1 b
Using the property of inverse matrices, we get:
x = A^-1 b
Implications
The Crammer rule has significant implications in various mathematical fields, including:
1. _Linear Algebra_: Solving systems of linear equations.
2. _Calculus_: Finding derivatives and integrals.
3. _Statistics_: Linear regression and data analysis.
4. _Physics_: Solving problems in mechanics, electromagnetism, and quantum mechanics.
Conclusion
In conclusion, the Crammer rule is a powerful tool in mathematics, providing a method to solve systems of linear equations using matrix

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