- #1

- 21

- 0

1 2 0 3 1 ||-2

0 0 1 2 4 || 5

0 0 0 0 0 || 0

0 0 0 0 0 || 0

a) Find all solutions to the system

b)If

a1= (1,1,3,4) and a3= (2,-1,1,3)

determine b.

I got part a to be

x1=-2-2r-3t-w

x2=5-2t-4w

x3=r

x4=t

x5=w

I'm having difficulty getting part b. I know a1 and a3 are column vectors and I know Ax=x1a1+x2a2+...+xnan. The textbook solution says its b=(8,-7,-1,7)^T