Step 1:

Elimination method.

The system of equations are $\"\"$

$\"\"$

Use the elimination method to make a system of two equations in two variables.

To eliminate the $\"\"$ variable, subtract equation (3) from (2).

$\"\"$

Multiply on each side of the equation (2) by 2.

$\"\"$

To eliminate the $\"\"$ variable, subtract equation (5) from equation (1).

$\"\"$

Multiply on each side of the equation (4) by 13.

$\"\"$

To eliminate the $\"\"$ variable, subtract equation (6) from (7).

$\"\"$

Substitute $\"\"$ in equation (4).

$\"\"$

Substitute $\"\"$ and $\"\"$ in equation (2).

$\"\"$

Solution:

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