document.write( "Question 105380: Solve the system by addition
\n" ); document.write( "x + y = 6
\n" ); document.write( "x – y = 4\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #78046 by Joeshie(9)\"\" \"About 
You can put this solution on YOUR website!
If you didn't know, you can not only add numbers and variables but whole equations!\r
\n" ); document.write( "\n" ); document.write( "To demonstrate this we can use your problem:
\n" ); document.write( "x + y = 6
\n" ); document.write( "x – y = 4\r
\n" ); document.write( "\n" ); document.write( "All you do to do this by addition, would be to add:\r
\n" ); document.write( "\n" ); document.write( "(x+y)+(x-y)=(6)+(4)\r
\n" ); document.write( "\n" ); document.write( "This would simplify into:
\n" ); document.write( "2x = 10
\n" ); document.write( "x = 5\r
\n" ); document.write( "\n" ); document.write( "Substitution:\r
\n" ); document.write( "\n" ); document.write( "5 - y = 4\r
\n" ); document.write( "\n" ); document.write( "Subtract 5 on both sides to get\r
\n" ); document.write( "\n" ); document.write( "-y = 4 - 5
\n" ); document.write( "
\n" ); document.write( "Simplify:
\n" ); document.write( "-y = -1
\n" ); document.write( "y = 1\r
\n" ); document.write( "\n" ); document.write( "The solution is: (5,1)
\n" ); document.write( " \n" ); document.write( "
\n" );