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