Answer:
The answer in slope-intercept form is y = 3x - 2.
24 miles per gallon times 18 gallon tank = 432 miles on one tank of gasoline. 432 times 2 = 864 so two full tanks of gas will be enough for the family road trip of 800 miles.
Divide the total amount made by the number of lawns mowed:
12 / 3 = 4
They made $4 per lawn.