Question

Y is inversely proportional to x. when y = 7, x = 9. work out the value of y when x = 21

Answer 1

Answer:

y=3

Step-by-step explanation:

y∝ $\frac{1}{x}$

7∝ $\frac{1}{9}$ .................(i)

y' ∝ $\frac{1}{21}$..................(ii)

from (i) and (ii) we get

7 = $\frac{1}{9}$ / y' = $\frac{1}{21}$.

on solving we get y'=3

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