The system of equations are
.
Equation 1: 
Equation 2:
.
Solve the first equation for y since the coefficient is 1.
\Equation 1: 
Subtract
from each side.

.
The value of
substitute in the second equation,
.



Subtract 12 from each side
\

Divide each side by negative 2
\

The value of
substitute in the either equation to find y.
Equation 1: 


Subtract 6 from each side
\

The solution is
.
The solution is
.