document.write( "Question 454258: solve using substitution method\r
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\n" ); document.write( "-5x - 6y = 8 \n" ); document.write( "

Algebra.Com's Answer #853390 by ikleyn(53538) $\"\"$ $\"About$

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\n" ); document.write( "Linear-systems/454258: solve using substitution method
\n" ); document.write( "x - 5y = 17
\n" ); document.write( "-5x - 6y = 8
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\n" ); document.write( "\n" ); document.write( "        The way how @mananth solves the problem in his post is absolutely incorrect.\r
\n" ); document.write( "\n" ); document.write( "        He makes tons of incorrect calculations and invites visitors follow his wrong way,\r
\n" ); document.write( "\n" ); document.write( "        which only can lead you to the firm score of '2'.\r
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document.write( "In this case, you are lucky, because you can easy express 'x' from the first equation\r\n" );
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document.write( "    x = 5y + 17.\r\n" );
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document.write( "Now substitute it into the second equation, replacing 'x' there\r\n" );
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document.write( "    -5(5y+17) - 6y = 8.\r\n" );
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document.write( "Simplify and find 'y'\r\n" );
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document.write( "    -25y - 85 - 6y = 8,\r\n" );
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document.write( "    -25y - 6y = 8 + 85\r\n" );
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document.write( "    -31y = 93,\r\n" );
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document.write( "       y =  = -3.\r\n" );
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document.write( "Now calculate 'x'  from that expression which you got above from the first equation\r\n" );
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document.write( "    x = 5y + 17 = 5*(-3)+17 = -15 + 17 = 2.\r\n" );
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document.write( "ANSWER.  x = 2, y = -3.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved correctly.\r
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\n" ); document.write( "\n" ); document.write( "Ignore the post by @mananth and never even try to solve equations in the way he does.\r
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