Question

The variable x varies directly as y,and when y is 28 and x is 4/7 .find y when x is 14.

Answer 1

Given : The variable x varies directly as y

when y is 28 ,  x is 4/7

To Find : y when x = 14

Solution:

The variable x varies directly as y

=> x  =  ky

y = 28  => x = 4/7

4/7  = k 28

=> 1/7 = k (7)

=> k  = 1/49  

x = (1/49)y

=> y = 49x  

x = 14

=> y = 49(14)

=> y = 686

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