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The value of y varies directly with x If x equals 3 than y equals 21 what is the value of c when the value of y equals 105

User Aleris
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If y and x varies directly we can use a rule of 3 to find the missing x so:


\begin{gathered} 3\to21 \\ x\to105 \end{gathered}

and the equation will be:


\begin{gathered} x=(3\cdot105)/(21) \\ x=15 \end{gathered}

User Ricky Ponting
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