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Natali5045456 [20]
3 years ago
6

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

Mathematics
1 answer:
kozerog [31]3 years ago
6 0
Because α varies directley to β
\alpha = k \beta
(k = constant)

α=7 when β=2
7= 2k
k= \frac{7}{2}

so when α=21
21= \frac{7}{2} b
b= 6

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