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Quiz4 solutions 225

# Quiz4 solutions 225 - Math 225 — Quiz 4 October 8 2009...

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Unformatted text preview: Math. 225 — Quiz 4 ' October 8, 2009 Use both sides of the paper if necessary (1) Determine which of these matrices are invertible. Justify your answers: AMA: ~3r+u +0 m) -\A WVUﬁﬂiﬁJ 3: wires rows W: Hume: ) (Wye «MC w c am {war “é“jv‘w 3 pivot: . '5 H“; 3.] ‘ ”ms dear-Lt») m 1 was W L000; .2 MM 30 C7 E‘s mi in.U€r"§W§E(—‘ W “Wm (2) Let T be the map from R2 to R2 given by T(a:, y) = (—520 + 9y, 4:1: —— 7y) . (a) Find a matrix A so that (writing vectors in R2 as columns) (b) Show that T is invertible and ﬁnd a formula for T ‘1 M-A: 35“3\é\$*,l A, ““447 e 9 ‘9" Ag" w -5 45’ i a i E z z ‘r H ...
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