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Question

If y is directly proportional to x & when x=2 & y=4, what is constant of proportionality?

A
1
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B
3
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C
5
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D
2
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Solution

The correct option is D 2
By definition of proportionality,
If y is directly proportional to x,
y α x
y=Kx .......Equation 1
where K is constant of proprtionality
Now,
Given that x=2,y=4
putting the above values in Equation 1 we get,
4=K×2
K=2

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