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The value of y varies directly with x and the constant of variation is 4. What is the value of x when y=84?

The value of y varies directly with x and the constant of variation is 4. What is the value of x when y=84?
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The value of y varies directly with x and the constant of variation is 4. What is the value of x when y=84?

User Dhh
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y varying directly with x means y equals a constant multiplying x: y=kx
in this case, k=4, so 84=4x
x=21
User IntoVoid
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