Answer Happy

I need the answer by 10:40 AM IST, please It's my homework and need to be done in time, I will upvote only if I get the correct answer by the given time! Thank you...
= (i) Check whether the set W, = {(x, y)|x/y = 1,x,y E R} is a subspace of R2 (ii) Let t e R, then discuss the linear independence of the vectors a, = (1,1,0), Q2 = (1,3,-1), az (1,3,-1), az = (5,3,t) over R. , For what value(s) of a, the set S = {(0,1, a),(a, 1,0),(1, a, 1)} is a basis for R3