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15-08-2016
Mathematics

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y varies directly as x.if y=-5 when x =15find x when y=3

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15-08-2016

y=kx
-5=k(15)
-5/15=k
-1/3=k
now,
y=-1/5x
3=-1/5x
3×5=-1(x)
15=-1(x)
multiplying both sides by -1,we get
-15=x

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