Use an inequality and the five-step process
Rick’s Automotive charges $50 plus $15 for each (15-min) unit of time when making a road call. Twin City Repair charges $70 plus $10 for each unit of time. Under what circumstances would it be more economical for a motorist to call Rick’s? This is what I had, and my teacher says I'm wrong.Someone help me please.
-Since Rick's has to be more economical, his price should be lower than Twin City Repair's.
Therefore the inequality is as such:
50 + 15x

Question

Use an inequality and the five-step process 
Rick’s Automotive charges $50 plus $15 for each (15-min) unit of time when making a road call. Twin City Repair charges $70 plus $10 for each unit of time. Under what circumstances would it be more economical for a motorist to call Rick’s? This is what I had, and my teacher says I'm wrong.Someone help me please.
-Since Rick's has to be more economical, his price should be lower than Twin City Repair's. 
Therefore the inequality is as such: 
50 + 15x < 70 + 10x 
5x < 20 
x < 4
So Rick's is more economical when it takes less than 4 units of time

anonymous · Answer

i have read this now three times and i don't see anything wrong with it.

anonymous · Answer

Thanks