Repeat Exercise 5 for each of the following linear systems: (a) x + y + 2z + 3w = 13 x - 2y + z + w = 8 3x+ y + z- w=1 (b ) x + y + z = I x+y - 2z=3 2x+y+ z =2 (e) 2{ + y + z - 2w = 3x - 2y + z - 6w = - 2 x+ y- z- w= - I 6x + z- 9w= - 2 5x - y + 2z - 8w = 3

L5 - 3 x Properties of graphs of f(x)= b and −1 f (x)=o lg b (x): b> 1 0