3 algebra 2 notetaking guide 83 your notes checkpoint

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Unformatted text preview: ises. 1. Evaluate the determinant 5 4 of 2. Find the area of a triangle with vertices (3, 0), ( 2, 2), and ( 2, 2). 2 . 3 7 10 CRAMER’S RULE FOR A 2 2 SYSTEM Let A be the coefficient matrix of ax cx e f 0 , then the system has exactly one solution. If det A e db f x by dy det A a fe c and y det A Using Cramer’s Rule for a 2 Example 3 2 System Use Cramer’s rule to solve this system: 2x 3y 2 3x 6y 0 Evaluate the determinant of the coefficient matrix. 2 3 3 6 12 9 3 Apply Cramer’s rule because the determinant is not 0 . 2 0 3 6 x 12 3 3 22 30 y 3...
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