document.write( "Question 245800: 9x-9y=9
\n" ); document.write( "7y-3x=-5
\n" ); document.write( "This one is supposed to be solved by the elimination method
\n" ); document.write( "the solution is an ordered pair, and I am really stumped, can someone help pleeese!!Thank You. \n" ); document.write( "
Algebra.Com's Answer #179469 by nerdybill(7384)\"\" \"About 
You can put this solution on YOUR website!
You have two unknowns and two equations:
\n" ); document.write( "9x-9y=9
\n" ); document.write( "7y-3x=-5
\n" ); document.write( ".
\n" ); document.write( "Reordering the second equation:
\n" ); document.write( " 9x-9y=9
\n" ); document.write( "-3x+7y=-5
\n" ); document.write( ".
\n" ); document.write( "The idea is to combine (add) both equations together to get rid of one of the unknowns.
\n" ); document.write( ".
\n" ); document.write( "We start by multiplying the second equation by 3:
\n" ); document.write( " 9x-9y=9
\n" ); document.write( "3(-3x+7y)=3(-5)
\n" ); document.write( ".
\n" ); document.write( " 9x-9y=9
\n" ); document.write( "-9x+21y=-15
\n" ); document.write( ".
\n" ); document.write( "Now, we add the two equations together:
\n" ); document.write( " 9x-9y=9
\n" ); document.write( "-9x+21y=-15
\n" ); document.write( "------------
\n" ); document.write( " 12y=-6
\n" ); document.write( " y = -6/12
\n" ); document.write( " y = -1/2
\n" ); document.write( ".
\n" ); document.write( "Substitute the above into our original first equation:
\n" ); document.write( "9x-9y=9
\n" ); document.write( "9x-9(-1/2)=9
\n" ); document.write( "9x-(-9/2)=9
\n" ); document.write( "9x+9/2=9
\n" ); document.write( "x+1/2=1
\n" ); document.write( "x = 1-1/2
\n" ); document.write( "x = 1/2
\n" ); document.write( ".
\n" ); document.write( "Solution:
\n" ); document.write( "(x,y) = (1/2, -1/2)\r
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