Matrices and Systems of Linear Equations

Find A-B

• -3     1
  7     -1

• 1     0
  1     -4

• -4       0
  6     -1

• not possible because rows do not match columns

Find the product of the two matrices.

• undefined

• -3   16
  17   12
  8   -10

• 3   12 
  -15  -8
  -1   -3

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Which matrix equation represents this system of equations?

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• 
• 
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What do w, x, y and z equal in this matrix subtraction?

• w = 13, x = 4, y = 7, z = 23

• w = 13, x = -4, y = 11, z = 23

• w = 13, x = 4, y = 11, z = 23

• w = 13, x = 4, y = 11, z = 17

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 in the second row, third column?

• 8

• 9.01

• 6

• 1

find: B*A

• 47     30
  9     5

• 17     15
  42     35

• 10     25
  7     1

• not possible because rows do not match columns

What must be true in order to ADD two matrices?

• They must be square.

• The dimensions must be the same.

• The determinant can't equal 0.

• The column of the 1st must equal the row of the 2nd.