Question

Given that y is directly proportional to x and that y = 40 when x = 200,the value of y when x = 15 is

Answer 1

Answer:

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

Answer 2

Answer:

16

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