Define any variables that you use. Write an equation or inequality to describe the problem. Write your answer in a sentence and check your answer in the original problem.
the entire perimeter would be: x+x+x+x+x+(x+5)+(x+5) or 7x + 10 so 7x+10 = 150 7x = 140 x = 20 x+5 = 25 So the outer dimensions would be 20x45 feet 2) h = hours using backhoe z = hours using bulldozer h + z = 40 z = 40-h 300h + 500z = 18500 3h + 5z = 185 substitute 40-h for z: 3h + 5(40-h) = 185 3h + 200 - 5h = 185 -2h = -15 h = 15/2 = 7.5 hours 7.5(300) + 32.5(500) = 2250 + 16250 = 18500 Best of luck!
