Margaret drove to a business appointment at 70 mph. Her average speed on the return trip was 60 mph. The return trip took 1/2 hr longer because of heavy traffic. How far did she travel to the appointment?

Remember, you can do anything to an equation as long as you do it to both sidesminus 36 from both sides4.5(8-x)=66-2.5(3x+24)distribute36-4.5x=66-7.5x-60add like terms36-4.5x=-7.5x+6add 7.5x to both sides36+3x=6minus 36 from both sides3x=-30divide both sides by 3x=-10