document.write( "Question 61039: P=a+b+c for c
\n" ); document.write( "E=mc^2 for c
\n" ); document.write( "y+x=a for y
\n" ); document.write( "3x-y=7 for y \n" ); document.write( "
Algebra.Com's Answer #42057 by tutorcecilia(2152)\"\" \"About 
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To solve these equations, isolate the variable to one side of the equation. To isolate the variable, \"undo\" or reverse the operations:
\n" ); document.write( "P=a+b+c
\n" ); document.write( "P-a-b=a+b+c-a-b
\n" ); document.write( "P-a-b=c
\n" ); document.write( ".
\n" ); document.write( "E=mc^2
\n" ); document.write( "(1/m)(E)=(1/m)(mc^2)
\n" ); document.write( "E/m=c^2
\n" ); document.write( "\"sqrt%28E%2Fm%29=sqrt%28c%5E2%29%29\"\r
\n" ); document.write( "\n" ); document.write( "\"sqrt%28E%2Fm%29=c%29%29\"\r
\n" ); document.write( "\n" ); document.write( ".
\n" ); document.write( "y+x=a for y
\n" ); document.write( "y+x-x=-x+a
\n" ); document.write( "y=-x+a
\n" ); document.write( ".\r
\n" ); document.write( "\n" ); document.write( "3x-y=7 for y
\n" ); document.write( "3x-3x-y=-3x+7
\n" ); document.write( "-y=-3x+7
\n" ); document.write( "-y/-1=(-3/-1)x+(7/-1)
\n" ); document.write( "y=3x-7
\n" ); document.write( " \n" ); document.write( "
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