Columns without leading 1's in a reduced row-echelon form of the augmented matrix are called free variables. So, yes it will have 2 free variables corresponding to the two columns without leading 1. In homogeneous system it remains true.
A.It is less than -7 5/8 because multiplying by a number less than 1 gives a smaller number. B.It is greater than -4 because 0.36×(7 5/8) 0.36*(7 5/8) is less than 1/2 * 8 C.It equals -7 5/8 because 36/36 equals 1 , and 1 times any number equals that number. D.It equals 0 because 0.36 rounded to the nearest whole number is 0 , and 0 times any number is 0. THESE ARE ALL THE ANSWER CHOICES!!!
