What is the answer to this

3x = 2y+14   (1)

y = -6x+18    (2)     sub (2)  into (1)

3x = 2 ( -6x+18 ) + 14

3x = - 12x + 36 +  14

3x = - 12x + 50     add 12x to both sides

15x  = 50       divide both sides by 15

x= 50/15  = 10/3

And  

y = -6(10/3)+18  =  - 20 + 18  = -2