document.write( "Question 806781: Solve each system by addition, if possible\r
\n" ); document.write( "\n" ); document.write( "Having trouble understanding this.\r
\n" ); document.write( "\n" ); document.write( "x + y = 1
\n" ); document.write( "x - y = 7\r
\n" ); document.write( "\n" ); document.write( "Do I add it together like this:\r
\n" ); document.write( "\n" ); document.write( "x + y = 1
\n" ); document.write( "x - y = 7
\n" ); document.write( "--------------
\n" ); document.write( "2x = 8\r
\n" ); document.write( "\n" ); document.write( "Then, should I divide it like this:\r
\n" ); document.write( "\n" ); document.write( "8/2x = 4
\n" ); document.write( "

Algebra.Com's Answer #486017 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
Solve each system by addition, if possible
\n" ); document.write( "Having trouble understanding this.
\n" ); document.write( "x + y = 1
\n" ); document.write( "x - y = 7
\n" ); document.write( "Do I add it together like this:
\n" ); document.write( "x + y = 1
\n" ); document.write( "x - y = 7
\n" ); document.write( "--------------
\n" ); document.write( "2x = 8
\n" ); document.write( "Then, This
\n" ); document.write( "x = 8/2
\n" ); document.write( "x = 4
\n" ); document.write( "Find y using the 1st equation
\n" ); document.write( "4 + y = 1
\n" ); document.write( "y = 1 - 4
\n" ); document.write( "y = -3
\n" ); document.write( "Check the solutions in the 2nd equation
\n" ); document.write( "4 - (-3) =
\n" ); document.write( "Minus a minus is plus, therefore
\n" ); document.write( "4 + 3 = 7
\n" ); document.write( "
\n" );