The quantities of x and y are proportional. find the constant of proportionality (r) in the equation y= rx

All you have to do is choose one of the rows, and then substitute in the values for x and y into the equation y = rx, and then solve for r:

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I'll choose the first row, where x = 8  when y = 2:

   (substitute in, x = 8  and y = 2)

   (divide both sides by 8)

   (simplify the fraction)

   (Change to a decimal)

So

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