Homework Help: Algebra

Posted by mysterychicken on Friday, May 6, 2011 at 1:39pm.

Need help with these--

40. The graph of the following system yields perpendicular lines:

x + 2y = -10
-4y = 2x + 20

True or False?

42. If we multiply a 2 x 2 matrix with a 2 x 1 matrix, the product is a 2 x 1 matrix.
-False?

Thanks
-MC

Algebra - Jackie, Friday, May 6, 2011 at 2:27pm
41. False. If you solve both equations for "y", you will get the same line; which means they can not be perpendicular.

42. True. When you have two matrices multiplied together, (2 x 2)(2 x1). If the two inner numbers match, then your resulting matrix will be the two outer numbers.
Algebra - mysterychicken, Friday, May 6, 2011 at 2:30pm
Thank you!
-MC

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