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Sample edHelper.com - Matrices Worksheet

 Name _____________________________ Date ___________________
Matrices
(Answer ID # 0211938)
Complete.
1.
 15 -6 17 13 16 -7
+
 -15 -11 -4 -14 17 11

2.
 19 13
+
 17 20

Complete.
3.
 15 -17 -6 1 -10 11 7 -2 -19 19 -15 4
-
 -7 2 -1 3 -14 -17 5 14 17 -11 13 9

4.
 -7 -20 18
-
 17 -11 6

Complete.
5.
 4 -3
+
 -20 -18
-
 18 9

Complete.
6.
 -18 17 2 0 -12 -9 -8 11 -15 8 10 6
-
 4 12 18 -1 13 5 14 -4 -5 -2 -19 9
-
 -7 -10 -13 11 -15 -2 -6 3 4 12 16 8

Find the product. If the product is not defined, state the reason.
7.
 11 -1 19 12 6 -2 2 3 10 9 0 -16 -6 18 13 -4

 -17 0 -14 6 -2 19 10 -6 16 -7 14 8 15 -16 -13 -9

Solve for x and y.
8.
 x 8 16 -19

 17 -15 14 -3
=
 -228 276 y -183

Calculate the determinant of each matrix. Show your work.
9.
 18 5 9 -4

10.
 -6 18 -17 16

11.
 -9 5 16 -16

Calculate the determinant of each matrix. Show your work.
12.   Use the diagonals method.
 0 14 -6 1 -11 -13 -20 15 11

13.   Expand along column 1.
 -8 17 -14 -17 -6 9 8 2 -9

14.
 11 -19 18 -11

Use determinants to calculate the area. Show your work.
 15 Calculate the area of the triangle with the following points:(0, -4), (2, -2), (-4, -2)
 16 Calculate the area of the triangle with the following points:(-6, 1), (0, 0), (-2, 3)
 17 Calculate the area of the triangle with the following points:(0, -5), (-1, -9), (5, -1)

Use determinants to calculate the area. Show your work.
 18 Calculate the area of the quadrilateral with the following points:(-1, -3), (0, 0), (2, 1), (4, -7)
 19 Calculate the area of the quadrilateral with the following points:(-1, 3), (-1, 8), (3, 5), (7, -1)
 20 Calculate the area of the quadrilateral with the following points:(-4, -2), (-2, 1), (1, 0), (5, -3)

Complete.
21.   Find the inverse of:
 8 -3 -5 -8

22.   Find the inverse of:
 7 -5 4 -10

23.   Find the inverse of:
 6 -6 -4 12

Solve the matrix equation.
24.
 9 -10 12 0
X    =
 62 59 -24 12

25.
 -6 -2 5 -8
X    =
 -84 60 -17 -79

Write the system of linear equations represented by each matrix equation.
26.
 8 -4 3 2

 x y
=
 148 24

27.
 -9 -6 5 -8 -9 -4 5 -1 -7

 x y z
=
 28 55 -3

Use the inverse of the linear system to solve for x, y, and z.
28.   -3x + 8y + 1z = -18
-2x - 6y - 9z = -15
-6x + 5y + 3z = 13
A-1  =
 27/353 -19/353 -66/353 60/353 -3/353 -29/353 -46/353 -33/353 34/353

29.   9x - 8y + 4z = 52
-1x - 7y - 2z = 13
-2x + 8y + 4z = -52
A-1  =
 3/65 -16/65 -11/65 -2/65 -11/65 -7/130 11/130 14/65 71/260

Write the augmented matrix for the linear system and then solve.
 30 -6x - 7y = -123x + 2y = 15
 31 -1x + 3y = -145x - 6y = 25

Solve each system of equations using Cramer's rule.
 32 -6x - 4y + 7z = -1321x - 6y + 3z = -13-4x - 7y - 9z = 53
 33 5x - 2y = -7-4x + 5y = -8
 34 -3x + 7y = 65-9x + 6y = -15

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