document.write( "Question 187743: The equation of the line through (3, -1) and parallel to the line through (1,2) and (2,1).\r
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Algebra.Com's Answer #140770 by jojo14344(1513)\"\" \"About 
You can put this solution on YOUR website!

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\n" ); document.write( "First, we find the Line Eqn thru points (1,2) & (2,1) via Slope-Intercept From;
\n" ); document.write( "\"m=%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29=%281-2%29%2F%282-1%29=-1%2F1=red%28-1%29\"
\n" ); document.write( "Since parallel to the line passing thru (3,-1)---->\"m%5B1%5D=m%5B2%5D=-1\"\r
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\n" ); document.write( "\n" ); document.write( "Then on point (3,-1), via Point Slope-Form:
\n" ); document.write( "\"y=mx%2Bb\"---->\"-1=%28-1%29%283%29%2Bb\"---->\"b=-1%2B3=2\" Y-Intercept\r
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\n" ); document.write( "\n" ); document.write( "Therefore the Line Eqn-----> \"y=-x%2B2\"---> x+y=2 Standard Form
\n" ); document.write( "We can get the line eqn to where it is parallel. Thru point (1,2):
\n" ); document.write( "\"y=mx%2Bb\"---->\"2=-1%281%29%2Bb\"---->\"b=2%2B1=red%283%29\"
\n" ); document.write( "Thru point (2,1): ---->\"1=%28-1%29%282%29%2Bb\" --->\"b=1%2B2=red%283%29\"
\n" ); document.write( "So it follows--->\"y=-x%2B3\"
\n" ); document.write( "We see the lines:
\n" ); document.write( "----> RED, \"y=-x=3\"; GREEN, x+y=2, or \"y=-x%2B2\"
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