Question 1079717
{{{system(6x+6.5y=56,x+y=9)}}}


{{{6x+6.5(9-x)=56}}}
{{{6x-6.5x+58.5=56}}}
{{{-0.5x=56-58.5}}}
{{{0.5x=2.5}}}
{{{x=5}}}
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{{{y=4}}}
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5 of the $6 books
4 of the $6.50 books