Question

The graph below shows monthly cell phone plan of Alexandra. Find how much charge she has to pay for a minute.

• A. 0.3 dollars
• B. 3 dollars
• C. 0.6 dollars
• D. 1 dollar

Answer 1

The correct option is A 0.3 dollars

Slope of the line represents the unit rate.

To find the slope of the line, take tow points (3,0.9) and (6,1.8) on the line.

Slope(m) = $\frac{Rise}{Run}$

= $\frac{1.8-0.9}{6-3}$

= $\frac{0.9}{3}$

= 0.3

Hence, charge for 1 minute of call is 0.3 dollar.