By the end of February, Rachel's family had used
7
,
800
7,800 kilowatt hours (kWh) of electricity since they had moved in. On average, her family uses
900
k
W
h
900kWh of electricity every month. Let
�
x represent the number of months since the end of February and let
�
y represent the electric meter reading, in kWh.
Part A
Determine a function using
�
x and
�
y that models the relationship above.
Part B
What is the coordinate pair that represents the data for the electricity usage in Rachel's home at the end of June?
(
(
,
)
)