suppose a varies directly as b, and a=7 when b=2 find b when a =21

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03-11-2014
Mathematics

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suppose a varies directly as b, and a=7 when b=2 find b when a =21

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jackattackblunt jackattackblunt · Answer 1 · 2014-11-03T22:25:11+01:00

jackattackblunt jackattackblunt

03-11-2014

because α varies directley to β
[tex] \alpha = k \beta [/tex]
(k = constant)

α=7 when β=2
7= 2k
k= [tex] \frac{7}{2} [/tex]

so when α=21
21= [tex] \frac{7}{2} [/tex] b
b= 6

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