Answer:
Cost after 9 months = $420
Cost for 0 months = $60
Step-by-step explanation:
Given that:
Cost of new cell phone = $60
Cost for unlimited calls per month = $40
Function to represent the total cost per month:
[tex]y = 40x+60[/tex] ..... (1)
where y is the total cost and
x is the number of months.
To find:
Total cost after 9 months and 0 months.
Solution:
Let us put the value [tex]x = 9[/tex] in the above equation (1)
[tex]y = 40 \times 9 +60\\\Rightarrow y = 360 +60\\\Rightarrow y = \$420[/tex]
Hence, cost after 9 months = $420.
Cost after 0 months i.e. put the value [tex]x = 0[/tex] in the above equation (1)
[tex]y = 40 \times 0 +60\\\Rightarrow y = 0+60\\\Rightarrow y = \$60[/tex]
i.e. only cell phone is bought no cost for call is given.
Cost for 0 months is equal to the cost of cell phone.
So, the answers are:
Cost after 9 months = $420
Cost for 0 months = $60
