document.write( "Question 1196459: Solve the system by the substitution method.\r
\n" ); document.write( "\n" ); document.write( "X+2y=-2\r
\n" ); document.write( "\n" ); document.write( "Y=-2x-13 \n" ); document.write( "

Algebra.Com's Answer #829288 by MathLover1(20850) $\"\"$ $\"About$

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\n" ); document.write( " $\"x%2B2y=-2\"$ .......eq.1
\n" ); document.write( " $\"y=-2x-13\"$ ......eq.2
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\n" ); document.write( "\n" ); document.write( "start with \r
\n" ); document.write( "\n" ); document.write( " $\"x%2B2y=-2\"$ .......eq.1........solve for $\"x\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x=-2y-2\"$ .......eq.1a\r
\n" ); document.write( "\n" ); document.write( "go to\r
\n" ); document.write( "\n" ); document.write( " $\"y=-2x-13\"$ ......eq.2, substitute $\"x\"$ from eq.1a\r
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\n" ); document.write( "\n" ); document.write( " $\"y=-2%28-2y-2%29-13\"$ .......... solve for $\"y\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y=4y%2B4-13\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y=4y-9\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"9=4y-y\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"9=3y\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y=3\"$ \r
\n" ); document.write( "\n" ); document.write( "go to eq.1a, substitute $\"3\"$ for $\"y\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"x=-2%2A3-2\"$ .......eq.1a\r
\n" ); document.write( "\n" ); document.write( " $\"x=-6-2\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x=-8\"$ \r
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\n" ); document.write( "\n" ); document.write( "solution: $\"x=-8\"$ , $\"y=3\"$ \r
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