AAA car rental charges a daily rental fee of $55 plus 30 cents per kilometre. Value car rental charges a daily fee of only $25, but the per kilometer charge is 42 cents. Using d for daily fee and k for number of km, create an equation representing the cost of
renting a car from each company. Then graph the equation to answer these questions :
a) At how many km do the companies cost the same ?
b) Which company would you use if you had to drive 500 km ?