Show that the set V of all 2x2 upper triangular matrices is asubspace of M22

I need to turn this in tonight by 12 pm. Please, help!

Show that the set V of all 2x2 upper triangular matrices is asubspace of M22

I need to turn this in tonight by 12 pm. Please, help!

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An analogous explanation is given here. It is not for upper triangular matrices, but fits your criteria in that it involves a subspace.

http://mathforum.org/library/drmath/view/65411.html

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I spent all weekend doing my homework, and seems like I am not even half way done. The textbook doesn't explain very well, and this is really frustrating. Thank you!