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what does dimensions of the matrix mean

i'm stuck on a homework assignment that I wasn't there for yesterday and I need help on how to do it.

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Susan L. | Tutor in Math and Science--Patient, Proficient, OrganizedTutor in Math and Science--Patient, Prof...
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Dimensions of a matrix refer to the number of rows and number of columns
 
Matrix Dimension = rows x columns
 
1   2   3
4   5   6
7   8   9
1   2   3
 
The matrix above has 4 rows (horizontal) and 3 columns (vertical) so it is a 4 x 3 matrix.