you didn't give the options but constant of proportionality is a number you have to multiply x by to get y.
y=kx is the equation that expresses the proportionality of x and y
the constant of proportionality is k, so k=2
y= kx becomes y=2x
so y = 2x should be the answer
Answer:
HUH!!!??
Step-by-step explanation:
Multiply 50 by .4 or .40. Both give the same answer, which is 20.
The Answer is A.12 because 8 times 4 =32,And 3 times 4 = 12