pratyushpadhy00 pratyushpadhy00
  • 21-05-2018
  • Mathematics
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Value of a varies directly as the square of the value of b, and b=3 when a=10. What is a when b=9?

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altavistard
altavistard altavistard
  • 21-05-2018
General equation:  a = k*b^2

Specifically:          10 = k*(3)^2 = 9 k

Solving for k:  k = 10/9

Then a = (10/9)b^2.    If b = 9, then a = (10/9)(9)^2 = 90 (answer)
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