document.write( "Question 1014328: Use the substitution method to solve each linear system.
\n" ); document.write( "a) x-2y=7
\n" ); document.write( "y=-x+1
\n" ); document.write( "b) x+3y=5
\n" ); document.write( "-2x+y=4
\n" ); document.write( "c) -x+3y+1=0
\n" ); document.write( "3x-y+1=0
\n" ); document.write( "d) 4x-3y=-13
\n" ); document.write( "-2x+y=4 \n" ); document.write( "
Algebra.Com's Answer #630662 by ikleyn(52781)\"\" \"About 
You can put this solution on YOUR website!
.
\n" ); document.write( "Use the substitution method to solve each linear system.
\n" ); document.write( "a) x-2y=7
\n" ); document.write( "y=-x+1
\n" ); document.write( "b) x+3y=5
\n" ); document.write( "-2x+y=4
\n" ); document.write( "c) -x+3y+1=0
\n" ); document.write( "3x-y+1=0
\n" ); document.write( "d) 4x-3y=-13
\n" ); document.write( "-2x+y=4
\n" ); document.write( "-----------------------------------\r
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\n" ); document.write( "\n" ); document.write( "Hello,\r
\n" ); document.write( "\n" ); document.write( "our goal in this site is to teach you, to show you, to help you.
\n" ); document.write( "And not to work instead of you.\r
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\n" ); document.write( "\n" ); document.write( "THEREFORE, I will show you how to solve only one of these examples.\r
\n" ); document.write( "\n" ); document.write( "You will do the rest yourself.\r
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document.write( "a)\r\n" );
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document.write( "x - 2y = 7   (1)\r\n" );
document.write( "y = -x + 1   (2)\r\n" );
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document.write( "Substitute y expressed via x from (2) to (1).\r\n" );
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document.write( "You will get\r\n" );
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document.write( "x - 2*(-x + 1) = 7.\r\n" );
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document.write( "Simplify it:\r\n" );
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document.write( "x + 2x - 2 = 7,\r\n" );
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document.write( "3x = 7 + 2,\r\n" );
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document.write( "3x = 9,\r\n" );
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document.write( "x = \"9%2F3\" = 3.\r\n" );
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document.write( "Now substitute the found value of x into (2). You will get\r\n" );
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document.write( "y = -3 + 1 = -2.\r\n" );
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document.write( "As the last step, check you solution.\r\n" );
document.write( "For it, substitute x = 3 and y = -2 into the original equations.\r\n" );
document.write( "Please do it yourself.\r\n" );
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