If ‘x’ and ‘y’ are in a direct proportion then which of the following is correct?
a)x –y = constant
b)x + y = constant
c)x × y = constant
d)x/y = constant
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Hence, y ∝ 1/x, where 1/2 is the proportionality constant. 3. If x and y are directly proportional, then which of the following is correct? k=x/y, where k is a constant.
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