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Practice Test 4

# Practice Test 4 - solve them 16 Three times one number plus...

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Chapter 4 Practice Test Solve each system of equations by graphing: 1. 2x – 2y = -4 and x + y = 6 2. y = ½ x - 1 and y = ½ x + 3 3. 2x + y = 2 and 6x + 3y = 6

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Evaluate the determinants: 4. 4 2 5. 2 -3 3 5 4 -4 6. 4 -2 2 6 -1 3 2 1 1 7. Solve using Cramer’s Rule: 2x – 5y = -4 x + 3y = 9 8. Solve using matrices: x + y – z = 6 -2x – y + 3z = -14 -x + 2y – z = 3
Solve using any method: 9. x + 4y = 1 x = -2y – 1 10. 2x + y = 6 -x – ½ y = -3 11. -x + 2y = -9 x – 2y = 13 12. x – 2y = 4 4x + y = 7 13. 7x – 6y = -5 4x + 4y = 12

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14. 5x + y + 3z = 1 x – y + 3z = -7 -x + y = 1 15. 2x + y + z = -1 3x – y + 2z = -4 x – 2y -3z = -3 Write a system of equations to model each problem; you do not have to
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Unformatted text preview: solve them! 16. Three times one number plus a second number is 40, and the one number minus the second number is 4. 17. The seats in a small concert hall are divided into sections A and B. Section A tickets are \$18, while Section B tickets are \$12. If 138 tickets are sold for a total of \$1986, how many seats in each section were purchased? 18. A candy shop mixes M&M’s worth \$2 per pound with trail mix worth \$1.50 per pound. Find how many pounds of each should be used to get 50 pounds of a mixture worth \$1.80 per pound....
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Practice Test 4 - solve them 16 Three times one number plus...

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