Posted by Marie on Saturday, February 27, 2010 at 12:57pm.
using echelon method
4x2y=9
20x10y=27
pls help with problem. Once I get 24x 2y 36 I'm confused after that.

Math  Reiny, Saturday, February 27, 2010 at 1:44pm
Somebody expects you to solve a 2 by 2 system using matrices with echelon reduced form ??
That's like going to the corner store to buy milk in an 18 wheeler tractortrailer.
Furthermore the system has no solutions, since if you multiply the first by 5, you get
20x  10y = 45
now subtract the two to get
0 = 18
CONTRADICTION, so no solution.

Math  Marie, Saturday, February 27, 2010 at 2:03pm
Thanks Reiny
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