document.write( "Question 118026: One number is 12 less than another. If 10 times the smaller number minus 2 times the larger number is 8, find the two numbers \n" ); document.write( "
Algebra.Com's Answer #86071 by jim_thompson5910(35256)\"\" \"About 
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Let x=one number (smaller number) and y=another number (larger number)\r
\n" ); document.write( "\n" ); document.write( "The sentence \"One number is 12 less than another\" translates to \"x=y-12\" and the sentence \"10 times the smaller number minus 2 times the larger number is 8\" translates to \"10x-2y=8\"\r
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\n" ); document.write( "\n" ); document.write( "So we get the system \r
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\n" ); document.write( "\n" ); document.write( "\"x=y-12\"
\n" ); document.write( "\"10x-2y=8\"\r
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\n" ); document.write( "\n" ); document.write( "Start with the given system\r
\n" ); document.write( "\n" ); document.write( "\"10x-2y=8\"
\n" ); document.write( "\"x=y-12\"\r
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\n" ); document.write( "\n" ); document.write( "\"10%28y-12%29-2y=8\" Plug in \"x=y-12\" into the first equation. In other words, replace each \"x\" with \"y-12\". Notice we've eliminated the \"x\" variables. So we now have a simple equation with one unknown.\r
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\n" ); document.write( "\n" ); document.write( "\"10y-120-2y=8\" Distribute\r
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\n" ); document.write( "\n" ); document.write( "\"8y-120=8\" Combine like terms on the left side\r
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\n" ); document.write( "\n" ); document.write( "\"8y=8%2B120\"Add 120 to both sides\r
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\n" ); document.write( "\n" ); document.write( "\"8y=128\" Combine like terms on the right side\r
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\n" ); document.write( "\n" ); document.write( "\"y=%28128%29%2F%288%29\" Divide both sides by 8 to isolate y\r
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\n" ); document.write( "\n" ); document.write( "\"y=16\" Divide\r
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\n" ); document.write( "\n" ); document.write( "Now that we know that \"y=16\", we can plug this into \"x=y-12\" to find \"x\"\r
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\n" ); document.write( "\n" ); document.write( "\"x=%2816%29-12\" Substitute \"16\" for each \"y\"\r
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\n" ); document.write( "\n" ); document.write( "\"x=4\" Simplify\r
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\n" ); document.write( "\n" ); document.write( "So our answer is \"x=4\" and \"y=16\" which means our numbers are 4 and 16
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