Discrete Quiz Matrix Applications

Evaluate the determinant of the matrix.

• -21

• 0

• 9

• 12

Calculate the determinant

• 0

• -15

• -70

• 10

What is the area of the triangle with vertices A(41,24), B(3,-1) and C(7,1)?

• 6

• 12

• 18

• 24

What is the area of triangle XYZ with vertices X(8,-6), Y(-4,2) and Z(-18,-12)?

• 280

• 140

• 180

• 240

Solve the system using matrices
x + 2y = 2
5x - 6y = - 54

• (-6, 4)

• (-8, 4)

• (8, 4)

• (6, 4)

Solve the system using matrices
3x - 8x = 32
x + y = 7

• (-8, 1)

• (8, -1)

• (-1,8)

• (1, -8)

Find the determinant of the following matrix.

• -7

• 7

• -23

• 23

Calculate the determinant

• 13

• -3

• -5

• 13

Calculate the determinant

• 0

• none

• -32

• -8

Find the determinant of the following matrix.

• -12

• -10

• 12

• 10