<p>I have my final coming up on Tuesday, and I'd like to know why any vectors of the form (a, b, 0) do NOT form a subspace for R3...while vectors of the form (a, 0, 0) do. Thanks a lot.</p>

<p>Have you tried <a href="http://www.artofproblemsolving.com%5B/url%5D">www.artofproblemsolving.com</a> ?</p>

<p>i dunno wat math u have... and i dont understand wat ur saying, but wat i can say is that, the vector (a,b,0) is on the xy-plane only since the z is 0.

... u prolly kno that already. im in Precalc, r u in algebra.. or like AP calc...</p>

<p>You'd probably have more luck in one of the advanced forums at artofproblemsolving. Try this one: <a href="http://www.artofproblemsolving.com/Forum/index.php?f=353%5B/url%5D">http://www.artofproblemsolving.com/Forum/index.php?f=353</a></p>

<p>I'd help you, but I won't have linear algebra until next semester.</p>

<p>Thanks for the links.</p>