Question 255599
The given equations are,
                 y=3x-18     ...(1)
                 4x+2y=24
Dividing by 2,   2x+y = 12   ...(2)
(1)-(2)=>        -2x = 3x-18-12
                 -2x-3x = -30
                 -5x = -30
                  5x = 30
                   x = 30/5
                   x = 6
Substituting in (1),
                   y = 3*6-18
                   y = 18-18
                   y = 0
Therefore the solution is x=6, y=0