document.write( "Question 396901: Patrick visited the school store. NOtebooks cost 75 cents and pens cost 50 cents. How many different combinations of notebooks and pens could Patrick buy for $5.00? \n" ); document.write( "

Algebra.Com's Answer #281423 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"x\"$ = number of notebooks
\n" ); document.write( "Let $\"y\"$ = number of pens
\n" ); document.write( " $\".75x+%2B+.5y+=+5\"$
\n" ); document.write( " $\"75x+%2B+50y+=+500\"$
\n" ); document.write( " $\"50y+=+-75x+%2B+500\"$
\n" ); document.write( " $\"y+=+-%283%2F2%29%2Ax+%2B+10\"$
\n" ); document.write( "I'll plot this
\n" ); document.write( " $\"+graph%28+400%2C+400%2C+-5%2C+13%2C+-5%2C+13%2C+-%283%2F2%29%2Ax+%2B+10%29+\"$
\n" ); document.write( "The equation shows that only an even number will
\n" ); document.write( "work for $\"x\"$ . The plot shows this number can only
\n" ); document.write( "be 2,4,or 6
\n" ); document.write( "The allowed points are (2,7),(4,4), and (6,1)
\n" ); document.write( " \n" ); document.write( "

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