Question

The graph shows the number of turtles that can be cured vs the time taken to cure them (in days).


How many turtles can be cured in two days?

• A. 3
• B. 9
• C. 8
• D. 10

Answer 1

The correct option is B 9


Observe the two points given on the graph (1.2,5.4) and (2.8,12.6)

You know,
$\text{slope = unit rate =}\frac{changeiny}{changeinx}=\frac{y_2-y_1}{x_2-x_1}$


∴ Putting the values you get,
$\text{Unit rate =}\frac{y_2-y_1}{x_2-x_1}$
$=\frac{12.6-5.4}{2.8-1.2}$
$=\frac{7.2}{1.6}$
$=4.5$

So, number of turtles cured in 2 days = $4.5\times 2=9$