The quantities x and y are
proportional
x. y
2. 14
6. 42
11. 77
find the constant of proportionality (r) in the equation
y=rx

r = 7  

Step-by-step explanation:

In a direct proportionality,

y = rx

Substitute a pair of values for x and y

77 = r × 11

Divide each side by 11

r = 77/11 = 7

250

step-by-step explanation:

constant of proportionality = 3 and the equation is c = 3p.

step-by-step explanation:

c = kp   where c = amount of caffeine in mg., p = oz of pepsi and k is the constant of proportionality.

substituting the values given:

24 = 8k

k = 3.

the same value of k will be obtained if we substitute the other given values.