Practice 7.5 Adding and Subtracting Matrices

Solve for matrix Y.

• -4    9
  -11    9

• 4   -8
  11   8

• 4   -9
  11   9

• -4   9
  11   -9

• A

• B

• C

• D

What values of x and y make the equation true?

• x = 5

  y = -2

• x = 3

  y = -5

• x = 9

  y = 10

• x = 16

  y = -5

Find B-A

• -3     1
  7     -1

• 1     0
  1     -4

• -4       0
  6     -1

• not possible because rows do not match columns

Find the values of x, y and z.

• 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

Given these matrices find A + B

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Given these matrices find B - A

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What is the value of the variable in the equation?

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Determine if you are finding the sum of an identity or opposite matrix then solve.

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