document.write( "Question 505274: X+3y=7
\n" ); document.write( "X-3y=-5 \n" ); document.write( "
Algebra.Com's Answer #339841 by Maths68(1474)\"\" \"About 
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X+3y=7 .................(1)
\n" ); document.write( "X-3y=-5 ................(2)\r
\n" ); document.write( "\n" ); document.write( "Add both equations\r
\n" ); document.write( "\n" ); document.write( "X+3y=7
\n" ); document.write( "X-3y=-5
\n" ); document.write( "--------------
\n" ); document.write( "2X=2
\n" ); document.write( "Divide by 2 both sides of above equation
\n" ); document.write( "2X/2=2/2
\n" ); document.write( "X=1\r
\n" ); document.write( "\n" ); document.write( "Put the value of X in (1)\r
\n" ); document.write( "\n" ); document.write( "X+3y=7
\n" ); document.write( "1+3y=7
\n" ); document.write( "Subtract 1 from both sides of the equation
\n" ); document.write( "1-1+3y=7-1
\n" ); document.write( "3y=6
\n" ); document.write( "Divide by 3 both sides of above equation
\n" ); document.write( "3y/3=6/3
\n" ); document.write( "y=2\r
\n" ); document.write( "\n" ); document.write( "Solution set (1, 2)\r
\n" ); document.write( "\n" ); document.write( "Check
\n" ); document.write( "Put the value of X and y in (1)
\n" ); document.write( "X+3y=7 .................(1)
\n" ); document.write( "1+3(2)=7
\n" ); document.write( "1+6=7
\n" ); document.write( "7=7\r
\n" ); document.write( "\n" ); document.write( "Put the value of X and y in (2)
\n" ); document.write( "X-3y=-5 ................(2)
\n" ); document.write( "1-3(2)=-5
\n" ); document.write( "1-6=-5
\n" ); document.write( "-5=-5
\n" ); document.write( " \n" ); document.write( "
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