(Solved): This Is For Linear Algebra. I Tried Both Parts Already And Believe Both Are Subspaces But Just Want ...

This is for linear algebra. I tried both parts already and
believe both are subspaces but just want to be sure.
Let W = {(a, b, c) EIR: c= 2a+b}, Is W a subspace of R ? Justify your answer - Let W = {f € . F (-os , a) : f (2) = 0} W a subspace of F (-2, 0) ? Justify Is your answer