The equations of linear system are
.
Here only two equations are used to find the two variables.
\The two equations are
.
Since the coefficient of the x - term in the above two equations is same, eliminate these terms by subtracting the equations.
\Write the equations in column form and subtract to eliminate variable x.
\
.
The resultant equation is
and solve it for y.
Divide each side by 9.
\
Cancel common terms.
\
.
Substitute the value of
in equation 2:
and solve for x.

Add 18 to each side.
\
.
The solution is
.