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A is a system of kxn type

the system has at leas one solution:

1.

if k>n does the system has endless solutions

??

2.

if k=n and Ax=b has a single solution then for any system Ax=c has a solution

??

for 1:

i dont know why we need the other data k<n means we have free variables so its endless solutions

for 2:

i dont know whats c