Answer
Use the 4 step procedure to solve for variation parameters.
Work Step by Step
Step 1. Write an equation using the given statement.
Suppose $y=kx$
Step 2. Substitute the given value of $x$ and $y$ in step 1 and find the value of $k$.
Suppose $x=2$ and $y=4$ then,
$\begin{align}
& 4=2k \\
& k=2 \\
\end{align}$
Step 3. Substitute $k=2$ in step 1.
$y=2x$
Step 4. Use the equation from step 3 to find the problem question according to given condition.
