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Y varies directly with x. if y =20 when x=4, what is y when x=2?

User Iquellis
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If y varies directly with x, this means that each time x increases one unit, y gets modified k times:

You can symbolize this as


y=kx

When y=20, x=4, with this you can determine the value of k as:


\begin{gathered} 20=4k \\ k=(20)/(4) \\ k=5 \end{gathered}

k=5 means that every time x increases one unit, y will increase 5 units.


y=5x

Now you can calculate the value of y for x=2 as


\begin{gathered} y=5\cdot2 \\ y=10 \end{gathered}

When x=2, y=10

User Clemens Sielaff
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