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Cumulative Review Exercises 317 18. Solve the system by using the addition method. 2x 3y 6 1 2 x 3 4 y 1 19. Solve the system by using the substitution method. 2x y 4 y 3x 1 20. The perimeter of a triangle is 7 m. The length of the longest side is twice the length of the shortest side. The sum of the lengths of the shortest side and the middle side is 1 m more than the length of the longest side. Find the lengths of the sides. 21. Two video clubs rent DVDs according to the following fee schedules: Club 1: $25 initiation fee plus $2.50 per DVD Club 2: $10 initiation fee plus $3.00 per DVD a. Write a linear function describing the total cost of renting x DVDs from Club 1. b. Write a linear function describing the total cost of renting x DVDs from Club 2. c. How many DVDs would have to be rented to make the cost for Club 1 the same as the cost for Club 2? 22. Solve the system. 3x 3 2y 3z 4x 5y 7z 1 2x 3y 2z 6 23. Determine the order of the matrix. c 4 5 1 2 6 0 d 24. Write an example of a 2 4 matrix. 25. Solve the system by using the Gauss-Jordan method. 2x 4y 2 4x y 5


miller_intermediate_algebra_4e_ch1_3
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