Question

The following graph shows the relation between the number of tickets and their prices. Find the constant of proportionality.

• A. 15
• B. 17.5
• C. 20
• D. 22.5

Answer 1

The correct option is D 22.5

Constant of proportionality = $\frac{y}{x}$

Consider the point (2, 45) on the line.

$\therefore$ Constant of proportionality = $\frac{45}{2}$
= 22.5

Hence, the constant of proportionality is 22.5