What is the constant of proportionality in the equation y = StartFraction x over 9 EndFraction?

1/9

Step-by-step explanation:

I'm assuming the equation you mean is y = (x/9) - - if so, parentheses aren't really required.

The equation for the constant of proportionality is y=kx. So, we will want to find the value of k, which is the constant. The y and x variables are in both equations already, and there is only the 1/9, which is k.

Therefore, the constant of proportionality is 1/9. We can check this answer by putting 1/9 back into the equation. y = 1/9 (x) or y = x/9.