applications of matrices and determinants

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slide 1 topic applications of matrices and determinants what you should learn use determinants to find areas of triangles. use determinants to decide whether points are collinear. use cramer’s rule to solve systems of linear equations. use matrices to encode and decode messages. area of a triangle area of a triangle in this section, you will study some additional applications of matrices and determinants. the first involves a formula for finding the area of a triangle whose vertices are given by three points on a rectangular coordinate system. example 1 – finding the area of a triangle find the area of the triangle whose vertices are (1, 0), (2, 2), and (4, 3) as shown in figure 7.28. figure 7.28 example 1 – solution begin by letting (x1, y1) = (1, 0), (x2, y2) = (2, 2), and (x3, y3) = (4, 3). then, to find the area of the …
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umn of constants as replacements for the coefficients of x and y as follows. coefficient matrix d dx dy cramer’s rule for example, given the system 2x – 5y = 3 – 4x + 3y = 8 the coefficient matrix, d, dx, and dy are as follows. coefficient matrix d dx dy example: using cramer’s rule for a 2x2 system use cramer’s rule to solve the system 4x – 2y = 10 3x – 5y = 11 solution: to begin, find the determinant of the coefficient matrix. d = = –20 – (–6) = –14 example 3 – solution because this determinant is not zero, apply cramer’s rule. cont’d = –1 so, the solution is x = 2 and y = –1. example 3 – solution cont’d cramer’s rule for 3x3 matrix let a be the coefficient matrix of this linear system: if det a is not 0, then the …
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multiply the uncoded row matrices by a (on the right) to obtain coded row matrices. here is an example. image2.jpeg image3.jpeg image4.jpeg image5.wmf image6.wmf image7.wmf image8.png image9.png image10.wmf image11.jpeg image12.jpeg image13.png image14.wmf image15.wmf image16.wmf image17.png image18.wmf image19.wmf image20.png image21.png image22.wmf image23.png image24.wmf image25.png image26.wmf image27.wmf image28.wmf image29.wmf image30.wmf image31.wmf image32.wmf image33.wmf image34.wmf image35.wmf image36.wmf oleobject1.bin oleobject2.bin oleobject3.bin oleobject4.bin oleobject5.bin image37.wmf image38.wmf image39.wmf image40.wmf image41.wmf image42.wmf image43.wmf oleobject6.bin oleobject11.bin oleobject12.bin oleobject7.bin oleobject8.bin oleobject9.bin oleobject10.bin image45.wmf image44.png oleobject13.bin image46.jpeg image47.wmf image48.png image49.jpeg image1.wmf det j k ab be ch l z a æö ç÷ ç÷ ç÷ èø = axbycz dxeyfz gxhy j l z k i ++= ì ï ++= í ï ++= î abc adef ghi æö ç÷ = ç÷ ç÷ èø det bc ef k l hi j x a æö ç÷ ç÷ ç÷ èø = det ac df k g l i j y a æö ç÷ ç÷ ç÷ …
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slide 1 topic applications of matrices and determinants what you should learn use determinants to find areas of triangles. use determinants to decide whether points are collinear. use cramer’s rule to solve systems of linear equations. use matrices to encode and decode messages. area of a triangle area of a triangle in this section, you will study some additional applications of matrices and determinants. the first involves a formula for finding the area of a triangle whose vertices are given by three points on a rectangular coordinate system. example 1 – finding the area of a triangle find the area of the triangle whose vertices are (1, 0), (2, 2), and (4, 3) as shown in figure 7.28. figure 7.28 …

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