$\"\"$

Elimination method:

The system of equations are

$\"\"$ ----------(1)

$\"\"$ ----------(2)

In the above system the coefficients of k - variable are opposite. $\"\"$

Add the equations to eliminate the k - variable and solve the equation.

$\"\"$

The resultant equation is $\"\"$ .

Divide each side by 11.

$\"\"$

The value of $\"\"$ substitute in either equation to find k.

First equation: $\"\"$ .

$\"\"$

Subtract 7.5 from each side.

$\"\"$

Divide each side by 4.

$\"\"$

The solution is $\"\"$ .