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ECA Review #15

ECA Review #15. Solving Systems of Equations by Substitution and Elimination. 40 % of the test will deal with linear equations and inequalities. Find the solution to the system of equations:. (-9,28) (28,9) (28,-9) (9,-28). [Default] [MC Any] [MC All].

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ECA Review #15

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  1. ECA Review #15 Solving Systems of Equations by Substitution and Elimination 40% of the test will deal with linear equations and inequalities

  2. Find the solution to the system of equations: • (-9,28) • (28,9) • (28,-9) • (9,-28) [Default] [MC Any] [MC All]

  3. Find the solution to the system of equations: • f = -14, t = -5 • f = 20, t = -7 • f = -20, t = -7 • f = 14, t = -5 [Default] [MC Any] [MC All]

  4. What values of x and y would make both equations true. Answer in the form (x,y) and use decimals for your answer. • (-1.5,1.4)

  5. 584 tickets have been sold for the school’s play. An adult ticket costs $5 and a student ticket costs $3. The total ticket sales are $2112. Use a system of equations to solve for the number of student tickets that have been sold for the play. • 404 • 0

  6. CHEAPER RENTAL charges its customers $20 per day plus a $50 initial payment to rent cars. LOW RAYTZ charges $30 per day to rent their cars, but they do not require any up-front costs. After how many days of renting will the total cost of renting a car be the same for both companies? • 30 days • 20 days • 10 days • 5 days [Default] [MC Any] [MC All]

  7. Solve the system of equationsWrite your answer as a coordinate pair. • (1,5)

  8. What value of x satisfies the system of equations? • 3 • 28 • 8 • -2 [Default] [MC Any] [MC All]

  9. What should you multiply the first equation by in order to solve the system using addition (elimination)?Equation 1: 2y + 3x = 10Equation 2: -6x + 9y = 20 • -3 • 3 • -2 • 2 [Default] [MC Any] [MC All]

  10. Two baby panda bears are born. One panda bear (named “Rocco”) weighs 120 lbs and gains 60 lbs per year. Another panda bear (named “Susie”) weighs only 100 lbs when she is born, but starts to gain 10 lbs per month. Which system of equations describes the relationship between the weight (W in lbs) of the panda bears and time (t in months)? • Rocco: W = 60t + 120, Susie: W = 10t + 100 • Rocco: W = 120t + 60, Susie: W = 100t + 10 • Rocco: W = 5t + 120, Susie: W = 10t + 100 • None of the above. [Default] [MC Any] [MC All]

  11. Tom has $22 in his bank account and he deposits $11.50 each week. His friend Jimmy has $218 in a savings account, but is withdrawing $13 each week. After how many weeks will Tom and Jimmy have the balance in their accounts? • 8 • 0

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