Notes

# Youmayuseacalculator 7 x y 2z2 y 2z1 3x 5y 10z

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Unformatted text preview: s no solution, state so; if there are infinitely many solutions, find any two of them. (You may use a calculator.) 7) x - y + 2z = 2 y - 2z = 1 - 3x + 5y - 10z = - 4 1 8) Solve by augmented matrix methods :(You may use a calculator) x 1 - 3 x 2 - 3 x 3 = 13 x 2 - 4 x 3 = 5 x 1 + x 3 = - 4 9) A grain company wants to lease a fleet of 20 railcars with a combined capacity of 108,000 cubic feet. Rail cars with three different carrying capacities are available: 3,000 cubic feet, 4,500 cubic feet, and 6,000 cubic feet. a) How many of each type of car should they lease? ___________________________________________________________________ b) The monthly rates for leasing these cars are \$180 for 3,000 cubic feet, \$225 for 4,500 cubic feet, and \$325 for 6,000 cubic feet. Which of the solutions in part (a) would minimize the monthly leasing cost? _______________...
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