document.write( "Question 524532: Solve -3=-2x+1 by graphing.\r
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\n" ); document.write( "\n" ); document.write( "I know how to solve for x, but then I dont know how to create another point to create the line. thanks! \n" ); document.write( "
Algebra.Com's Answer #347785 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "You probably did this:\r\n" );
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document.write( "   -3 = -2x + 1\r\n" );
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document.write( "   2x = 4\r\n" );
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document.write( "    x = 2\r\n" );
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document.write( "Now pretend that equation has a term \"0y\", \r\n" );
document.write( "so you can write it this way:\r\n" );
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document.write( "   x + 0y = 2\r\n" );
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document.write( "Now make a table of values:\r\n" );
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document.write( "     x | y\r\n" );
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document.write( "But only substitute arbitrary values for y and solve for x:\r\n" );
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document.write( "Let y = 4, -3, 1, and 7\r\n" );
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document.write( "     x | y\r\n" );
document.write( "       | 4\r\n" );
document.write( "       |-3\r\n" );
document.write( "       | 1\r\n" );
document.write( "       | 7\r\n" );
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document.write( " Substitute y=4 in  x + 0y = 2\r\n" );
document.write( "                  x + 0(4) = 2\r\n" );
document.write( "                     x + 0 = 2\r\n" );
document.write( "                         x = 2\r\n" );
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document.write( "Substitute y=-3 in  x + 0y = 2\r\n" );
document.write( "                 x + 0(-3) = 2\r\n" );
document.write( "                     x + 0 = 2\r\n" );
document.write( "                         x = 2\r\n" );
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document.write( " Substitute y=1 in  x + 0y = 2\r\n" );
document.write( "                  x + 0(1) = 2\r\n" );
document.write( "                     x + 0 = 2\r\n" );
document.write( "                         x = 2\r\n" );
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document.write( " Substitute y=7 in  x + 0y = 2\r\n" );
document.write( "                  x + 0(7) = 2\r\n" );
document.write( "                     x + 0 = 2\r\n" );
document.write( "                         x = 2\r\n" );
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document.write( "So we have this table of values:\r\n" );
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document.write( "     x | y\r\n" );
document.write( "     2 | 4\r\n" );
document.write( "     2 |-3\r\n" );
document.write( "     2 | 1\r\n" );
document.write( "     2 | 7\r\n" );
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document.write( "So we plot the points (2,4), (2,-3), (2,1) and (2,7)\r\n" );
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document.write( "Then connect the points with a straight line:\r\n" );
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document.write( "    \r\n" );
document.write( "So you see, it's just a vertical line.  When the equation does not\r\n" );
document.write( "contain a y, and is of the form\r\n" );
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document.write( "x = b\r\n" );
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document.write( "the graph is a vertical line that goes through (b,0).  You don't need\r\n" );
document.write( "to plot a bunch of points.  I just did it to show you why it works.\r\n" );
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document.write( "Edwin
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