To find the solution to a set of linear equations, set them both to y=kx form
In this case,
1) 3x+y=15 would be y= -3x+15
2) 2x+2y=6 would be y= -x+3
3) Set them equal to each other
4) -3x+15= -x+3
5) x=6
So now we know the x coordinate as 6
Plug in this x value in one of the y= equations
6) (-3×6)+y=15
(solve for y)
y= 33
Therefore, the solution is (6,33)
