2015/027) (2x +3y) is divisible by 17, then for what value of k ; (9x +ky) is divisible by 17?

options :
a)3
b)5
c)7
d)9

Solution 2015/027)

(2x+ 3y) is divisible by 17

so 2x + 20y is divisible by 17
so x + 10y is divisible by 17
so 9x + 90y is divisible by 17
so k = 90 mod 17 = 5
I have solved differently at https://in.answers.yahoo.com/question/index?qid=20131025093911AAFGa34