Math 2602 A1 , A2 , A3
Homework #9
Due Thursday
, March 27 , 2003
Let Ax = b be the matrix/vector form of the
following linear system:
2x + 4y
= 4
x + 2y + z
- w = 5
3x + 6y + 2z -2w = 12
(a) Find the dimension of the column space
of A.
_________
(b) Find the dimension of the null space of
A.
_________
(c) Find a basis for the null space of
A .
(d) Is b in the column
space of A when
i) b = (
2 , 3 , 7 )T ?
_________
ii) b = (
1 , 1 , 1 )T ?
_________
(e) How many solutions does Ax = b
have when b = ( 2 , 4 , 9 )T .
_________