If x-1/3y=3, then the value of 3x-y-6=?

Question

a) 15
b) 9
c) 6
d) 3
e) 0

Answer 1

from x - (1/3)y = 3
3x - y = 9
y = 3x-9

then,
3x - y - 6
= 3x - (3x-9) - 6
= 3