The constant is 36
because direct variation y/x
That's an interesting fact but what is your question that's what I'm curious about?
Example:
38 rounds to 40
6 rounds to 10
10+40 = 50
5 / 14
if you graph the two points, just count the units and put them in a simplified fraction (rise (up or down) divided by run (side to side))
The answer is: -4/a^2 b^2