Answer;
We can have the equation as;

where 3 is k which is the proportionality constant
Explanation;
Firstly, we need to understand the relation of being directly proportional
When two variables are proportional, the relationship between them is of the nature;

where K is the proportionality constant
We can have k as 3, and that means we have the relationship as;

So, from the question, x is ? and y = -6; we can have x calculated as;
