lilxems2 lilxems2

25-07-2019
Mathematics

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assume that y varies inversely with x. if y=7 when x=-2, find y when x=7

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wegnerkolmp2741o wegnerkolmp2741o

26-07-2019

Answer:

y=-2

Step-by-step explanation:

The formula for inverse variation is

xy =k

if y=7 when x=-2, we can substitute these numbers in to find k

(-2)(7) =k

-14 =k

The equation becomes

xy = -14

Let x =7

7y = -14

Divide each side by 7

7y/7 = -14/7

y = -2

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