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Cross-Multiplication Method of Finding Solution of a Pair of Linear Equations

Solve:x + 2y ...

Question

Solve:
x + 2y = 7
2x+y=11

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Solution

$x + 2 y = 7 x = 7 - 2 y \dots (1) 2 x + y = 11 2 (7 - 2 y) + y = 11 14 - 4 y + y = 11 - 3 y = - 3 y = 1$
Put it in $(1)$
$x = 7 - 2 = 5$

$x = 5; y = 1$

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x + y = 7

3 x - 2 y = 11

x - 2 y = 0 a n d 3 x - y = 5

Q. Solve by matrix inversion method

2 x - y = 7; 3 x - 2 y = 11

2 x - y = 7

3 x - 2 y = 11

by using matrix inversion method.

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Cross-Multiplication Method of Finding Solution of a Pair of Linear Equations

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