document.write( "Question 687768: Example question: Solve 3 linear equation and graph.
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\n" ); document.write( "-3y+x=7;
\n" ); document.write( "-x+y=1 \n" ); document.write( "
Algebra.Com's Answer #425351 by Edwin McCravy(20056)\"\" \"About 
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document.write( "Example question: Solve 3 linear equation and graph. \r\n" );
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document.write( "5x + 6y = 14\r\n" );
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document.write( "     6y = -5x + 14\r\n" );
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document.write( "      y = \"-5%2F6\"x + \"14%2F6\"\r\n" );
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document.write( "      y = \"-5%2F6\"x + \"7%2F3\"\r\n" );
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document.write( "compare to \r\n" );
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document.write( "      y = mx + b\r\n" );
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document.write( "The slope m = \"5%2F6\"\r\n" );
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document.write( "The y-intercept (0,b) is (0,\"7%2F3\")\r\n" );
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document.write( "To graph the line get a couple or three points.\r\n" );
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document.write( "Let x=1               Let x=4             Let x=-2\r\n" );
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document.write( "  5x + 6y = 14        5x + 6y = 14        5x + 6y = 14\r\n" );
document.write( "5(1) + 6y = 14      5(4) + 6y = 14     5(-2) + 6y = 14\r\n" );
document.write( "   5 + 6y = 14        20 + 6y = 14       -10 + 6y = 14\r\n" );
document.write( "       6y = 9              6y = -6             6y = 24\r\n" );
document.write( "        y = 1.5             y = -1              y = 4               \r\n" );
document.write( "   point(1,1.5)        point(4,-1)          point(-2,4)\r\n" );
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document.write( "Plot those three points:\r\n" );
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document.write( "Draw a line through those three points:\r\n" );
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document.write( "-----\r\n" );
document.write( "-3y + x = 7    Do as above, solve for y to find the slope.\r\n" );
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document.write( "Find three points by substituting x = -2, 1, and 4\r\n" );
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document.write( "-----\r\n" );
document.write( "-x + y = 1    Do as above, solve for y to find the slope.\r\n" );
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document.write( "Find three points by substituting x = -4, 0, and 3\r\n" );
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document.write( "Edwin
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