Hi,
How can I show that th set of all solutions to Ax = b where A is mxn, is not a subspace of R^n if b <> 0.
If Ax = 0, (b = 0), the set of solutions IS a subspace. What difference does it make whether b is 0 or not?
Thanks!
Hi,
How can I show that th set of all solutions to Ax = b where A is mxn, is not a subspace of R^n if b <> 0.
If Ax = 0, (b = 0), the set of solutions IS a subspace. What difference does it make whether b is 0 or not?
Thanks!
Suppose $\displaystyle x$ is a solution to this and $\displaystyle \lambda$ is a scalar, then $\displaystyle A(\lambda x)=\lambda b$, so $\displaystyle \lambda x$ is not in the set of solutions unless $\displaystyle b=0$, but if the set of solutions is a subspace it would have to be.
CB