Question

If y is directly proportional to x and y = 17.5 when x = 21, find y when x = 39.

Answer 1

The value of x given the value of y in the directly proportional relationship is 32.5.

What is the value of x?

The equation that can be used to represent a directly proportional relationship is : x = ky

Where:

• y = independent variable
• x = dependent variable
• k = constant

The value of k has to be determined first:

21 = 17.5k

k = 21 / 17.5

k = 1.2

The value of y

y = 39 / 1.2

y = 32.5

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