Add Matrices

What must be true in order to ADD two matrices?

• They must be square.

• The dimensions must be equal.

• The determinant can't equal 0.

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

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• No solution

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Add the matrices.

​ (a)   ​ (b)  

​ (c)   ​ (d)   ​

• 11

• 8

• -4

• 2

• 10

• 28

• -5

• -8

• 15

• 18

Find the sum of both matrices.

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• 
• 
• 

Find the sum of both matrices.

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• 
• 
• 

Find A + B

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• 
• 

Perform the indicated operation

• 
• 
• 
• 
• not possible

• a
• b
• c
• d

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

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• 

To add or subtract matrices, the ​number of ​ (a)   ​ and ​ (b)   ​ of each matrix must be ​ (c)  

• rows

• columns

• equal.