The value of x given the value of y in the directly proportional relationship is 32.5.
The equation that can be used to represent a directly proportional relationship is : x = ky
Where:
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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