document.write( "Question 1064972: ABC is reflected about the line Y = - x to give A ' B ' C with vertices , A ' (-1,1) , B ' (-2,-1) , C (-1,0) . What are the vertices of ABC' ? \n" ); document.write( "
Algebra.Com's Answer #680155 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "The green line is the line y = -x.\r\n" );
document.write( "We are to reflect the triangle and its three vertices\r\n" );
document.write( "about the green line.   \r\n" );
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document.write( "One of those points is ON the green line, so it will \r\n" );
document.write( "reflect into ITSELF!  The other two will reflect on the\r\n" );
document.write( "other side of the green line like this:\r\n" );
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document.write( "All that's left for you to do is to give the coordinates\r\n" );
document.write( "of the reflected points, which I am sure you can do\r\n" );
document.write( "without my help.\r\n" );
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document.write( "Edwin
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