$\"\"$

\

Guassian elimination method :

\

System of equations are

\

$\"\"$

\

Eliminate the $\"\"$ terms by using equation $\"\"$ and equation $\"\"$ .

\

$\"\"$

\

Multiply the equation $\"\"$ by $\"\"$ .

\

$\"\"$

\

Subtract equation $\"\"$ from equation $\"\"$ .

\

$\"\"$

\

$\"\"$

\

Eliminate the $\"\"$ terms by using equation $\"\"$ and equation $\"\"$ .

\

$\"\"$

\

Multiply the equation $\"\"$ by 4.

\

$\"\"$

\

Subtract equation $\"\"$ from equation $\"\"$ .

\

$\"\"$

\

$\"\"$

\

Solve the equations $\"\"$ and $\"\"$ .

\

$\"\"$

\

Multiply the equation $\"\"$ by $\"\"$ .

\

$\"\"$

\

Multiply the equation $\"\"$ by $\"\"$ .

\

$\"\"$

\

Subtract equation $\"\"$ from equation $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Substitute $\"\"$ in equation $\"\"$ .

\

$\"\"$

\

Substitute $\"\"$ and $\"\"$ in equation $\"\"$ .

\

$\"\"$ .

\

$\"\"$ , $\"\"$ , and $\"\"$ .

\

$\"\"$

\

$\"\"$ .