The variables x and y vary directly. Use the values to find the constant of proportionality, k. Then write an equation that relates x and y. y=72; x=3

The proportionality constant , and the equation that relates and is

Since and are related by direct proportion,

where is our proportionality constant. To find the value of , substitute the values into the formula, and solve for .

Thus the equation that relates and is

Learn more about direct proportion here: link

y = kx

Replace y and x to solve for k:

72 = 3k

Divide both sides by 3:

k = 24

Now replace k with 24:

y = 24x

a = 11 : 4

b = 38

c = 1 for every 6

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