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1 5.1 Simultaneous Linear Equations In consistent equations, *Find the solution to each system by graphing. 1. y Independent systems consist of x Three Cases: A. consistent and independent 2. y B. inconsistent and independent x C. consistent and dependent 3. Solve using substitution: Methods for Solving Systems: 5.1 Graphing, Substitution, Elimination 6.1 Matrix Row Reduction 6.3 Matrix Algebra 6.4 Determinants 82
2 5.1 #44 Solve: How many gallons of a 25% antifreeze and a 15% antifreeze solution must be mixed to obtain 15 gallons of a 23% antifreeze solution? ALEKS PROBLEM: Find all values of such that the system of equations Solve: does not have a solution. 83
3 5.2 Systems of Planes 5.2 #14 Solve: 5.2 #22 Solve: 84
4 5.2 #39 Solve: 5.2 #32 Solve: 85
5 5.2 #34 Solve: 5.2 #28 Solve: 86
6 ALEKS PROBLEM: Suppose that the augmented matrix of a system of linear equations for unknowns x, y and z is ALEKS PROBLEM: Suppose that the augmented matrix of a system of linear equations for unknowns x, y and z is Solve and provide the information requested. Solve and provide the information requested. 87
7 Solve: Solve: 88
8 5.3 Systems of Nonlinear Systems Possible Cases: Solve: y x 5.3 #10 Solve: 5.3 #23 Solve: 89
9 5.3 #49 Solve: 5.4 Introduction to Linear Programming Maximize subject to the following constraints: y y x x Solve: y x 90
10 Maximize following constraints: subject to the Maximize constraints: subject to the following 91
11 Stephen is taking a test with questions of type X which are worth 5 points each and questions of type Y which are worth 3 point each. Stephen must answer at least 2 questions of type X and 4 questions of type Y, however, time constraints are such that at most 10 questions in all can be answered. How many questions of each type should Stephen complete in order to maximize his score? 5.4 # 58 A waste disposal company is contracted to haul away some hazardous waste material. A full container of liquid waste weighs 800 lb and has a volume of 20 ft 3. A full container of solid waste weighs 600 lb. and has a volume of 30 ft 3. The trucks used can carry at most 10 tones (20,000 lb) and have a carrying volume of 800 ft 3. If the trucking company makes $300 for disposing of liquid waste and $400 for disposing of solid waste, what is the maximum revenue per truck that can be generated? 92
12 6.1 Solving Systems Using Row Operations on Matrices Solve: Write this system as an augmented matrix: Allowable Row Operations: 1. You may rows. 2. You may a row by a number (scalar). 3. You may add a of one row to another row. Goal/Process: 93
13 6.1 #38 Solve: Solve: 94
14 6.2 Operations with Matrices The of a matrix is its "size". The product of an and an matrix is of the order. Example: To add matrices, add their corresponding elements. You can only add matrices which have the same order. Given and, Note that multiplication of matrices in not necessarily commutative. Find Given and, find Find Notation: Given and, find 95
15 Given and, find ALEKS PROBLEM: Solve for x and y. Given, find. 96
16 ALEKS PROBLEM: Sketch the solution set to the following system of inequalities. 6.3 Finding the Inverse of a Matrix Method #1... This method always works. Find the inverse of. 97
17 Method #2 (only works for matrices) 6.4 Determinants, Cramers Rule & Partial Fractions A. Determinants Evaluate: Given, find, if it exists. Evaluate: In general, Given, find, if it exists. Evaluate: Evaluate: 98
18 B. Using Determinants Use Cramer's Rule to solve the following systems: Solve: 99
19 Three points are collinear if and only if The equation of a line passing through two given points can be found by simplifying: *Determine whether and lie on the same line. *Find the equation of the line which passes through and. The area of a triangle is given by. C. Partial Fraction Decomposition *Decompose each into partial fractions: (Use either to ensure the area is positive.) 1. *Find the area of the triangle having vertices and. 100
20 2. Without decomposing completely, set up the following partial fraction decompositions: #42 Decompose into partial fractions: 101
21 Chapter 5 & 6 Review 2. Solve using row operations: 1. Decompose into partial fractions: 102
22 3. Solve: 4. Decompose into partial fractions: 5. Decompose into partial fractions: 103
23 6. Maximize subject to: y 7. Solve: x Note: Vertices are at and 104
24 8. Graph: 12. Solve using Cramer's Rule: y x 9. Evaluate: 10. Evaluate: 13. Graph: y x 11. Given, find if it exists. 14. Find the value of such that the system has no solution: 105
25 15. Solve the system using matrices: Given: 16. Find and 17. Find AB, if possible. 18. Multiply: 19. Find if 106
26 20. Solve: 21. Solve: 107
27 22. Solve: 23. Given, find if it exists. 108
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