Question 1089159
.
The Substitution method.


First step is to divide both sides of the linear equation by 3.

The next step is to express x via y (or, in opposite, express y via x).



See the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Systems-of-equations/Solving-the-system-of-alg-eqns-of-deg2-deg1.lesson>Solving the system of algebraic equations of degree 2 and degree 1</A> 

in this site.