matrix inverses

Evaluate the determinant of the matrix.

• -21
• 0
• 9
• 12

A __________ matrix is a matrix with rows = columns.

• Same

• Equal

• Big

• Square

Select the square matrices

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• 
• 
• 

What is A^-1?

• 
• 
• 
• 

Solve the system.  Write the matrix equation on your own paper.
-5x + 5y = -10
-7x + 4y = 13

• (-7, -5)
• (-7, -9)
• (7, -9)
• (-7, 5)

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)

What is the name of each entry of a matrix?

• Row
• Element
• Dimension
• Rectangle

How many rows are in a 7 x 3 matrix?

• 7
• 3
• 21
• 10

How many columns are in a 5 x 4 matrix?

• 5
• 4
• 20
• 9