document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1171820>Question 1171820</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Which reason justifies the statement below?\r<BR>\n" );
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document.write( "“If PQ+RS=PS and RS=XY,  then PQ+XY=PS </SPAN>\n" );
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document.write( "Answer: Substitution Property\r<BR>\n" );
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document.write( "We substituted XY in for RS<BR>\n" );
document.write( "That's how we went from PQ+RS = PS to PQ+XY = PS<BR>\n" );
document.write( "This is valid because RS = XY, ie RS is the same as XY.<BR>\n" );
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