<PRE><B>Question 1177348</B>
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Three four-pound bags and nine one-pound bags for $27
One four-pound bag and five one-pound bags for $13
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3 of 4-pound bags and 9 of 1-pound bags:   $27;
1 of 4-pound bags and 5 of 1-pound bags:  $13



if y is price for a 4-pound bag 
and
x is price for a 1-pound bag 
then
{{{system(9x+3y=27,5x+4y=13)}}}


Notice you can reduce the first equation and have system
{{{system(3x+y=9,5x+4y=13)}}}



..

.

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