rockyhascurls rockyhascurls

21-10-2020
Mathematics

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Suppose y varies directly as x, and y = 7 when x = 2. Find x when y = 21.

Respuesta :

Garden555 Garden555

22-10-2020

Answer:

Step-by-step explanation:

y = k x X

7 = k x 2

7/2 = k...............1

hence y = 7/2x (substituting eq 1)

y = 21

therefore, x = 2y/7

x = 2 x 21

7

x = 2 x 3

x = 6

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