A truck can be rented from Company A for ​$70 a day plus ​$0.40 per mile. Company B charges ​$30 a day plus ​$0.80 per mile to rent the same truck. How many miles must be driven in a day to make the rental cost for Company A a better deal than Company​ B's?

Answer 1

y =70 + .40x
y = 30 + .80x

70 + .40 x < 30 + .80x

-.40x < -40

x > 100
When you multiply or divided across an inequality by a negative, you change the direction of the inequality.

Answer 2

A truck can be rented from company a for $70 a day plus .50 per mile company b charges $40 a day plus 0.60