document.write( "Question 1070949: Alyssa is buying miniature cars. She wants to buy 17 cars total for a big race she and her friends are having. Silver cars are $5 dollars each. Red cars are $7 dollars each. If she spends $111, how many red cars did she buy. Question=Write 2 equations s=silver and r=red. \r
\n" ); document.write( "\n" ); document.write( "Is this an equation i could use as an answer? 111=xR+yS \n" ); document.write( "
Algebra.Com's Answer #685924 by KMST(5328)\"\" \"About 
You can put this solution on YOUR website!
They mean for you to use \"r\" and \"s\" as your variables, like this:
\n" ); document.write( "\"r\"= number of red cars bought
\n" ); document.write( "\"s\"= number of silver cars bought.
\n" ); document.write( "The total number of cars bought is
\n" ); document.write( "\"r%2Bs=17\" and that is one of your equations.
\n" ); document.write( "The other one deals with the amount spent buying those cars.
\n" ); document.write( "The \"r\" red cars costed $\"7%2Ar\" .
\n" ); document.write( "The \"s\" silver cars bought costed $\"5%2As\" .
\n" ); document.write( "The amount Alyssa spent buying all those cars was $111, so
\n" ); document.write( "\"7r%2B5s=111\" , and that is the other equation you need.
\n" ); document.write( "You need to solve the system of linear equations
\n" ); document.write( "\"system%28r%2Bs=17%2C7r%2B5s=111%29\" <---> \"system%28s=17-r%2C7r%2B5s=111%29\"
\n" ); document.write( "but if you only need the value of \"r\" ,
\n" ); document.write( "substituting \"17-r\" for \"s\" in \"7r%2B5s=111\"
\n" ); document.write( "will give you an equation that you can solve for \"r\" :
\n" ); document.write( "\"7r%2B5%2817-r%29=111\"
\n" ); document.write( "\"7r%2B85-5r=111\"
\n" ); document.write( "\"2r%2B85=111\"
\n" ); document.write( "\"2r=111-85\"
\n" ); document.write( "\"2r=26\"
\n" ); document.write( "\"r=26%2F2\"
\n" ); document.write( "\"highlight%28r=13%29\"
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