3:5 my answer has to be 20 characters so im just typing the rest of this to answer your question.
I believe the answer is 15 because if you divide 270/18 you get 15 <span />
Answer:
x=-5
Step-by-step explanation:

X and y are proportional hence when y is multiplied by a number, x is multiplied by the same number.
18=6*3 hence when y=18,x=9*3=27
x=27
Ur answer is 2,1 and ur other one is 2,2