Matrices Review

How many columns are in a 5 x 4 matrix?

Mathematical Equivalence

ON

What is the name of each entry of a matrix? (a)  

• Row
• Element
• Dimension
• Numbers

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

In Matrix R (pictured) what element is r₂₃?

• 8

• 9.01

• 6

• 1

If the matrices can be multiplied, what dimension is the product? If not, write undefined.

• undefined

• ( 3 x 1 )

• ( 1 x 2 )

• ( 3 x 2 )

find: B*A

• 47     30
  9     5
• 17     15
  42     35
• 10     25
  7     1
• not possible because rows do not match columns

Matrix Multiplication is NOT defined for:

• SU
• UT
• SR
• TR

Express the following simultaneous linear equations in matrix form:

x + z - 3y = 4

2x - 8y + 8z = -2

-15z + 3y - 6x = 9

• 
• 
• 
• 

Solve for matrix X.

• -9
  5
  3
• 9
  13
  -9
• 15
  -5
  3
• 10
  4
  6

Solve for matrix Z.

• A
• B
• C
• D