Practice 7.5 Adding and Subtracting Matrices

Front

What is a matrix?

Back

A matrix is a rectangular array of numbers arranged in rows and columns.

Front

What does it mean for two matrices to be equal?

Back

Two matrices are equal if they have the same dimensions and corresponding elements are equal.

Front

What are the dimensions of a matrix?

Back

The dimensions of a matrix are given in the form of 'rows x columns'.

Front

What is matrix addition?

Back

Matrix addition is the operation of adding two matrices by adding their corresponding elements.

Front

What is matrix subtraction?

Back

Matrix subtraction is the operation of subtracting one matrix from another by subtracting their corresponding elements.

Front

What must be true in order to ADD two matrices?

Back

The dimensions of the matrices must be equal.

Front

What is the result of adding a 2x3 matrix and a 2x3 matrix?

Back

The result is another 2x3 matrix.

Front

How do you find the element in the 3rd row and 4th column of a matrix?

Back

Locate the 3rd row and then the 4th column in that row.

Front

What is the identity matrix?

Back

The identity matrix is a square matrix with ones on the diagonal and zeros elsewhere.

Front

What is the zero matrix?

Back

The zero matrix is a matrix in which all elements are zero.