document.write( "Question 582417: What is the image of A(3,-1) after a reflection, first across the line y=3, and then across the line x=-1? \n" ); document.write( "
Algebra.Com's Answer #372057 by Edwin McCravy(20060)\"\" \"About 
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What is the image of A(3,-1) after a reflection, first across the line y=3, and then across the line x=-1?
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document.write( "First we plot the point A(3,-1) and the horizontal line y = 3 (in green)\r\n" );
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document.write( "Now we pretend that the green line is a mirror facing the point.  Then\r\n" );
document.write( "we draw where A's image would appear to be.  Since A is 4 units below\r\n" );
document.write( "the green line, its image will be 4 units above the green line, at the\r\n" );
document.write( "point (3,7) \r\n" );
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document.write( "Now we draw the vertical line x = -1 (in blue)\r\n" );
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document.write( "Now we pretend that the blue line is a mirror facing the point (3,7).  \r\n" );
document.write( "Then we draw a point where its image would appear to be.  Since (3,7) \r\n" );
document.write( "is 4 units to the right the blue line, its image will be 4 units to the\r\n" );
document.write( "left of the blue line, at the point (-5,7) \r\n" );
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document.write( "Answer: (-5,7)\r\n" );
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document.write( "Edwin
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