pls help soon, my life depends on this test!!:))
-The following graph shows a relationship between the gallons of fuel remaining in a car's gas tank and the number of miles traveled.

-Find the equation for the line of best fit given in the above graph.

0.04, 21.15, -0.013, 17.2, -0.06, 16.92, +, -
y= _____x ____ ______

*add or subtraction sign on the middle line*