How do you write a specific formula to describe the variation: Q varies jointly with the inverse of the sum of b and R; Q=3 when b=7, R=3?

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Answer 1 · 2017-11-05T00:03:31

See process below;

#Q prop 1/(b + R)#

#Q = 1/(b + R) k#, where #k# is constant..

#Q = k/(b + R)#

Where;

#Q = 3#

#b = 7#

#R = 3#

#3 = k/(7 + 3)#

#3 = k/10#

#3/1 = k/10#

cross multiply..

#k = 3 xx 10#

#k = 30#

Hence the equation is..

#Q = 30/(b + R)#