The yearly cost y for driving a certain car is $7,800 for 10,000 miles
and $11,400 for 20,000 miles. Let x be the number of miles driven
in a year
Write a linear function that models this data. Then use the function to find the given value.

y=
(Simplify your answer and round to TWO decimal places, including zeros as needed. Example: 2 should be written as 2.00. Do not include commas.)

Estimate the number of miles driven when the yearly cost is $9,636.00.
miles
(Round your answer to TWO decimal places, including zeros as needed.
Example: 2 should be written as 2.00. Do not include commas.)