document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=428979>Question 428979</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 2x + y = 7<BR>\n" );
document.write( "x + 3y = 1\r<BR>\n" );
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document.write( "use substitution to solve<BR>\n" );
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document.write( "2x + y = 7<BR>\n" );
document.write( "x + 3y = 1 ------> x = -3y + 1 {subtracted 3y from both sides}\r<BR>\n" );
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document.write( "2(-3y + 1) + y = 7 {substituted -3y + 1, in for x, into top equation}<BR>\n" );
document.write( "-6y + 2 + y = 7 {used distributive property}<BR>\n" );
document.write( "-5y + 2 = 7 {combined like terms}<BR>\n" );
document.write( "5y = 5 {subtracted 2 from both sides}<BR>\n" );
document.write( "y = 1 {divided both sides by 5}\r<BR>\n" );
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document.write( "x = -3y + 1<BR>\n" );
document.write( "x = -3(1) + 1 {substituted 1, in for y, into x = -3y + 1}<BR>\n" );
document.write( "x = -3 + 1 {multiplied -3 by 1}<BR>\n" );
document.write( "x = -2 {combined like terms}\r<BR>\n" );
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document.write( "x = -2 and y = 1<BR>\n" );
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