True or False? In Exercises 85 and 86, determine whether each statement is true or

Chapter 2, Problem 85

(choose chapter or problem)

In Exercises 85 and 86, determine
whether each statement is true or false. If a statement
is true, give a reason or cite an appropriate statement
from the text. If a statement is false, provide an example
that shows the statement is not true in all cases or cite an
appropriate statement from the text.(a) For the product of two matrices to be defined, the
number of columns of the first matrix must equal
the number of rows of the second matrix.
(b) The system Ax = b is consistent if and only if b
can be expressed as a linear combination of the
columns of A, where the coefficients of the linear
combination are a solution of the system.