Warm Up #6 1. Let a = 4, b = – 5, c = – 2, and d = 7. Find ad – bc.

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Presentation transcript:

Warm Up #6 1. Let a = 4, b = – 5, c = – 2, and d = 7. Find ad – bc. (4)(7) – (-5)(-2) 28 – 10 18 2. Solve the linear system. 2x – 3y = 4 –x – 2y = –9 2x – 3(2) = 4 2( ) 2x – 3y = 4 –2x – 4y = –18 2x – 6 = 4 2x = 10 x = 5 -7y = -14 (5 , 2) y = 2

= 1(3*6 – 2*4) – 1(-1*6 – 0*4)+ 2(-1*2 – 0*3) 1(18 – 8) – 1(-6) +2(-2) = 10 +6 – 4 = 12

EXAMPLE 1 Evaluate determinants Evaluate the determinant of the matrix. a. 5 4 3 1 b. 2 3 4 1 – SOLUTION

Solve a system of equations in three variables using the graphing calculator APPS  PlySmlt2  #2  Enter the equation in augmented matrix form

Use the PolySmlt2 application on your calculator to solve: Gives: X1=3-2x3 Means: INFINITE # of Solutions X = -3 Y = 4 Z = 1 No solution