Question

If $x$ and $y$ are directly proportional then what will be the value of constant of proportionality?

$$\begin{array}{ccccc}x& 1& 2& 3& 4\\ y& 10& 20& 30& 40\end{array}$$

• A. $\frac{1}{10}$
• B. $\frac{1}{2}$
• C. $\frac{1}{5}$
• D. $\frac{2}{5}$

Answer 1

The correct option is A

$\frac{1}{10}$

Given that $x$ and $y$ are directly proportional.

So $\frac{x}{y}=\text{constant}$

$\therefore$ $\frac{x}{y}=\frac{1}{10}=\frac{2}{20}=\frac{3}{30}=\frac{4}{40}$