a rental car cost $18 a day, plus$.40 a mile driven. Stella's car rental bill came to $40.80. Write an equation you can use to find how many mies she drove.

Question

 a rental car cost $18 a day, plus$.40 a mile driven. Stella's car rental bill came to $40.80. Write an equation you can use to find how many mies she drove.

 

Answer 1

y =mx + b

 

y is the total $ 40.80 and the m is the .40 cents per mile ,$ 18 is the fixed amount

 

 

$40.80 = .40x +$18

 $18               -$18

_________________________

$22.80 = .40x

______   ____

.40          .40

 

57   = x   so Stella drove 57 miles

Answer 2

d represents the number of days

m represents the number of miles

 

18d + 0.40m = 40.80