document.write( "Question 659773: Solve the system using the ADDITION Method\r
\n" ); document.write( "\n" ); document.write( "2x+y+4
\n" ); document.write( "x-3y+9 \n" ); document.write( "
Algebra.Com's Answer #410921 by ReadingBoosters(3246)\"\" \"About 
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Starting with,
\n" ); document.write( "2x+ y+4
\n" ); document.write( " x-3y+9\r
\n" ); document.write( "\n" ); document.write( "Multiply the second equation by -2
\n" ); document.write( "-2(x-3y+9)
\n" ); document.write( "-2x + 6y - 18
\n" ); document.write( "Add this equation to the first equation
\n" ); document.write( "2x + -2x + y + 6y + 4 + -18
\n" ); document.write( "Combine like terms
\n" ); document.write( "7y - 14 = 0
\n" ); document.write( "7y - 14 + 14 = 0 + 14
\n" ); document.write( "7y = 14
\n" ); document.write( "7y/7 = 14/7
\n" ); document.write( "y = 2\r
\n" ); document.write( "\n" ); document.write( "Multiply the first equation by 3
\n" ); document.write( "3(2x+y+4)
\n" ); document.write( "6x + 3y + 12
\n" ); document.write( "Add to the second equation
\n" ); document.write( "6x + x + 3y + -3y + 12 + 9
\n" ); document.write( "Combine like terms
\n" ); document.write( "7x + 21 = 0
\n" ); document.write( "7x + 21 - 21 = 0 -21
\n" ); document.write( "7x = -21
\n" ); document.write( "7x/7 = -21/7
\n" ); document.write( "x = -3 \n" ); document.write( "
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