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Solving Equations with Linear Expressions on One Side and Numbers on the Other Side

If x and y va...

Question

If x and y vary inversly and x=15 when y= 6 , find y when x= 9 ?

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Solution

let x = k/y

xy = k

6 x 15 = k

k = 90

so when x = 9 y = k/x = 90/9 = 10

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