document.write( "Question 570138: x+y=9
\n" ); document.write( "y=2x \n" ); document.write( "
Algebra.Com's Answer #367570 by Maths68(1474)\"\" \"About 
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x+y=9.........(1)
\n" ); document.write( "y=2x........(2)
\n" ); document.write( "Put value of y from (2) to (1)\r
\n" ); document.write( "\n" ); document.write( "x+y=9
\n" ); document.write( "x+2x=9
\n" ); document.write( "3x=9
\n" ); document.write( "3x/3=9/3
\n" ); document.write( "x=3...............(3)
\n" ); document.write( "Put the value of x in (2)\r
\n" ); document.write( "\n" ); document.write( "y=2x
\n" ); document.write( "y=2(3)
\n" ); document.write( "y=6\r
\n" ); document.write( "\n" ); document.write( "x,y=3,6\r
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\n" ); document.write( "\n" ); document.write( "Check
\n" ); document.write( "Put the value of x and y in (1)
\n" ); document.write( "x+y=9.........(1)
\n" ); document.write( "3+6=9
\n" ); document.write( "9=9
\n" ); document.write( "Put the value of x and y in (2)
\n" ); document.write( "y=2x
\n" ); document.write( "6=2(3)
\n" ); document.write( "6=6
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