Question

F you rent a car for one day and drive it for 100 miles, the cost is $40.00. If you drive it 220 miles, the cost is $46.00.

What linear equation would represent the data points?

Answer 1

y=x+35 x is miles in 20 mile increments

Answer 2

Let x represent the number of miles travelled and y the cost. Then
y - 46 = (46 - 40)/(220 - 100) (x - 100)
y - 46 = 6/120 (x - 100)
y - 46 = 1/20(x - 100)
20(y - 46) = x - 100
20y - 920 = x - 100
x - 20y = -820