Consider matrix equation Ax = b with
2 6 3 7
A = 9 -1 5
and b = ( -5 4 )
(a) Use Elementary Row operations to convert the augmented matrix to RREF without
using fractions at any intermediate stage. Indicate the operations used in each step.
(b) Find the set of all solutions, write the solution in the vector form
2. Matrix A is given below. Do columns of A span R³? If not, describe the set of all b that
is not in the span of columns of A
1 -3 -4
A -3 2 6
5 - -1 -8
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