First of all, k is a number, a certain number, such as 2, then Y is proportional to X, X takes 1, and Y is 2; X takes 2 and y takes 4. This ratio is k or 2.
If k is 1000, x is 1 and y is1000; X takes 2 and y takes 2000, and this ratio is 1000.
This is a proportional function, I don't know if it will work.