How do you write directly proportional equations?

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I know that the formula for for inversly proportional is y = kx but I'm not sure how to write the formula. Also how can you solve b?

1 Answer
Jim G.
Nov 29, 2017

#"see explanation"#

Explanation:

#"(a)"#

#"the initial statement is "BpropR^4#

#rarrB=kR^4larrcolor(blue)"k is constant of variation"#

#"(b)"#

#"radius is reduced from "Rto1/2R#

#rArrB=k(1/2R)^4==k1/16R^4#

#"rate of blood flow reduces by a factor of "1/16#

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