# data[].attributes.body
A square matrix in which all the main diagonal elements are 1's and all the remaining elements are 0's.

# data[].attributes.headline
#1: Label the coefficient matrix and augmented matrix for the system below.

# data[].attributes.subject
#1: Label the coefficient matrix and augmented matrix for the system below.

# data[].attributes.body
A variable whose column in the RREF doesn't contain a leading 1.

# data[].attributes.body
A vector only having one column.

# data[].attributes.body
A vector only having one row.

# data[].attributes.headline
#2 Identify the correct term for the following definitions. 

# data[].attributes.subject
#2 Identify the correct term for the following definitions. 

# data[].attributes.body
The variables whose columns in the RREF contain leading 1's.