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A **__Matrix__** is a rectangular arrangement of numbers in rows and columns. __**Dimensions**__ are the number of rows by columns. The numbers in a matrix are its __**entries**__.

__Row Matrix-__ A matrix with only 1 row =[ 4 7 8 ]= __Column Matrix-__ A matrix with only 1 column



__Square Matrix-__ A matrix with the same # of row's and columns __Zero Matrix__- A matrix who's entries are all zero's


 * Two matrices are equal if their dimensions are the same and entries in corresponding positions are equal.
 * In Matrix Algebra a real number is often called a scaler.
 * To multiply a matrix by a scaler, you multiply each entry in the matrix by the scaler. This is called scaler multiplication.