Question 695157
Very good. You did everything correctly.

The only thing I would recommend is that you keep {{{k=15/9=5/3}}} instead of decimal number.

When multiplying {{{k=5/3}}} with {{{x=33}}}, you get {{{y=(5/3)*33=55}}}. 

The slight difference between your answer 55.003 and my answer 55 comes from rounding up the fraction {{{5/3}}} to 1.667. Keeping everything as fractions, always gives you the correct answers, where decimals might be a little bit off.