what the problem is asking you to solve, is the system:
which hopefully you know how to do by now.
For the first part, I got that they are dependent...I'm just double checking that that's right. For the second part, how does that prove or disprove that they span R4, and can I get a hint in the right direction for solving it, please?
Decide whether or not the following vectors are linearly independent, by solving c1v1+c2v2+c3v3+c4v4=0:
v1=(1,1,0,0)
v2=(1,0,1,0)
v3=(0,0,1,1)
v4=(0,1,0,1)
Decide also if they span R4 by trying to solve c1v1+c2v2+c3v3+c4v4=(0,0,0,1)