Question

The value of y varies directly with x. If x = 6, when y = 72. What is the value of x when y = 108?0O2

Answer 1

`\begin{gathered} y\propto x\Rightarrow y=kx \\ k=(y)/(x) \\ x=6,y=72 \\ k=(72)/(6)=12 \\ k=12 \end{gathered}`

To calculate for x, when y = 108, we substitute the value of y into the equation. We have:

`\begin{gathered} k=(y)/(x)\Rightarrow12=(108)/(x) \\ 12x=108 \\ x=9 \end{gathered}`