third month - second month = 63.20
second month - first month = 63.20 (remarkable)
so if
x = month number
y = cost for month x
then
cost for month x = y = 85.45 + 63.20 (x-1)
====================
check for month 3
y = 85.45 + 63.2(3-1) = 85.45 + 63.20*2 = 211.85
SkyHigh TV is a satellite television provider. They charge by the month. The first month of service costs $85.45. The second month of service costs $148.65. The third month of service costs $211.85. Write an equation in the form of
y = c + d( x −1)
to represent this situation. Explain your answer.
2 answers
Wow.