The solution is (3, 0).
To graph it, plot the points (0, -6) and (3, 0). Draw a line through the two points.
To get the solution, you can substitute y = 3 - x into the first equation, giving you:
x + (2x - 6) = 3
Solving for x, you get x = 3. Substituting x = 3 into either equation gives you y = 0. Therefore, the solution is (3, 0).