Answer:
9/6 and 3/2
Explanation:
Let's remember the definition of "constant of proportionality":
The constant of proportionality is the constant value of the ratio k of two proportional quantities x and y; usually written y = kx.
In our case, x is the cups of milk and y is the cups of pancake mix. We need to find out k.
9 = k*6
9/6 = k
If we simplified the fraction, we have 3/2 (is equivalent to 9/6).
The correct answers are 3/2 and 9/6.