document.write( "Question 82003: How do I demonstrate an algebraic equation on a \"number line\"? For example, how do I show X<6 on a \"number line\"? \n" ); document.write( "
Algebra.Com's Answer #58748 by Edwin McCravy(20056)\"\" \"About 
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How do I demonstrate an algebraic equation on a \"number line\"? For example, how do I show X<6 on a \"number line\"?
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document.write( "First draw a number line like this:\r\n" );
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document.write( " -6 -5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8  9 10     \r\n" );
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document.write( "Since it's \" < \", we put an OPEN circle at 6\r\n" );
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document.write( "--------------------------------------o------------\r\n" );
document.write( " -6 -5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8  9 10\r\n" );
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document.write( "(If it were \" < \", we'd put a closed circle)\r\n" );
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document.write( "Now since it's LESS THAN, we darken the number line\r\n" );
document.write( "to the LEFT of 6 and put an arrowhead on the far left\r\n" );
document.write( "end to show that it continues indefinitely to the\r\n" );
document.write( "left.\r\n" );
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document.write( "<=====================================o------------\r\n" );
document.write( " -6 -5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8  9 10\r\n" );
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document.write( "That's the graph of x < 6.\r\n" );
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document.write( "Another example:\r\n" );
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document.write( "To draw the graph of x > -3\r\n" );
document.write( "put a closed circle at -3 like this:\r\n" );
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document.write( "-----------=---------------------------------------\r\n" );
document.write( " -6 -5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8  9 10 \r\n" );
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document.write( "It's a closed circle because the inequality\r\n" );
document.write( "symbol is >\r\n" );
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document.write( "Then since it's GREATER THAN, we darken the number line\r\n" );
document.write( "to the RIGHT of -3 and put an arrowhead on the far right\r\n" );
document.write( "end to show that it continues indefinitely to the\r\n" );
document.write( "right.\r\n" );
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document.write( " -6 -5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8  9 10\r\n" );
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document.write( "That's the graph of x > -3\r\n" );
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document.write( "Edwin
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