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Matrix Addition & Subtraction
CONCEPTS
Matrix Properties
• A matrix is a rectangular array of element in columns & rows. Rows are named before columns, therefore a 2x4 matrix has 2 rows & 4 columns
• The size of the matrix is Height x Width
EXAMPLE
4 high and 1 wide
![](https://static.wixstatic.com/media/4b7508_2579c2032ef24fd5903aefe2ce3c648c~mv2.jpg/v1/fill/w_235,h_445,al_c,q_80,enc_auto/4b7508_2579c2032ef24fd5903aefe2ce3c648c~mv2.jpg)
Matrix Operators
![](https://static.wixstatic.com/media/4b7508_3da94bb60d334c2890020a3792e20318~mv2.jpg/v1/fill/w_773,h_199,al_c,q_80,enc_auto/4b7508_3da94bb60d334c2890020a3792e20318~mv2.jpg)
PRACTICE PROBLEMS
Question 1 Multiply the matrix by the scalar 4 (see below).
![](https://static.wixstatic.com/media/4b7508_a82fff77d76f40c2a169aae5f961e0d0~mv2.jpg/v1/fill/w_499,h_366,al_c,q_80,enc_auto/4b7508_a82fff77d76f40c2a169aae5f961e0d0~mv2.jpg)
-- Answer --
![](https://static.wixstatic.com/media/4b7508_6c8b6f7aa00d4d3d855477f06837be2b~mv2.jpg/v1/fill/w_562,h_295,al_c,q_80,enc_auto/4b7508_6c8b6f7aa00d4d3d855477f06837be2b~mv2.jpg)
Question 2 What's the result of adding the matrices
![](https://static.wixstatic.com/media/4b7508_63899498c9c54c2d921ec6968bdd91a9~mv2.jpg/v1/fill/w_568,h_195,al_c,q_80,enc_auto/4b7508_63899498c9c54c2d921ec6968bdd91a9~mv2.jpg)
-- Answer --
![](https://static.wixstatic.com/media/4b7508_05e5a05c9d4942618965c63f59cb560c~mv2.jpg/v1/fill/w_590,h_318,al_c,q_80,enc_auto/4b7508_05e5a05c9d4942618965c63f59cb560c~mv2.jpg)
ACT PRACTICE PROBLEMS
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