Question

The given graph shows the number of teachers $\left(x\right)$ and the number of students $\left(y\right)$ in a class
Find the number of students for each teacher.

• A. $15$
• B. $40$
• C. $10$
• D. $20$

Answer 1

The correct option is D $20$

The points marked on the graph are $(1,20)$ and $(2,40).$
Slope $=\frac{y_2-y_1}{x_2-x_1}=\frac{40-20}{2-1}=20$
Hence, the number of students for each teacher is $20.$