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Mathematics

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If y varies directly as x and y = 9 when x = –3, find y when x = 40.

Answer :

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Today at 4:15 AM

Answer:

y = -120

Step-by-step explanation:

Direct variation is

y = kx where k is a constant

9 = k(-3)

Divide each side by -3

9/-3 = k

-3 = k

y = -3x

Let x = 40

y = -3(40)

y = -120

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