Answer:
a) $80
b) $8
Step-by-step explanation:
a) The cost of the connection fee will be the y-intercept of the graph because that represents the price when no minutes (t = 0) have been used. We can identify the y-intercept, and connection fee, as:
[tex]\dfrac{2}{5} \times \$200 = \boxed{\$80}[/tex]
b) The cost per minute is how much the graph increases each minute, otherwise known as the slope:
cpm = slope = rise / run
[tex]\text{cpm} = \dfrac{\left(\dfrac{14}{15} \times \$600\right) - \$80}{60 - 0}[/tex]
[tex]\text{cpm} = \dfrac{\$560 - \$80}{60}[/tex]
[tex]\text{cpm} = \dfrac{\$480}{60}[/tex]
[tex]\text{cpm} = \boxed{\$8}[/tex]
