
Concept explainers
To find the value of b2

Answer to Problem 23PPS
the value of b2 is −10
Explanation of Solution
Given information:
a varies directly as b and inversely as c
the value of b1=12 when a1=8 and c1=3
Calculation:
The values of b2 can be obtained as
First set up a correct proportion for the information given
a1=kb1c1 and a2=kb2c2 [since, b varies directly as a so b goes in the numerator and c varies inversely as a,so c goes in the denominator]k=a1c1b1 and k=a2c2b2 [solve for k]a1b1c1=a2b2c2 [set the two proportion equal to each other]
Put the values of a1=8 , b1=12 , c1=3 , a2=5 and c2=−4 in above equation
(8)(3)12=(5)(−4)b2(8)(3)(b2)=(5)(−4)(12) [cross multiply]24b2=−240 [simplify]b2=−10 [divide each side by 24]
Hence,
the value of b2 is −10
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