document.write( "Question 238492: 4x + 5y = 51
\n" ); document.write( "4x - 5y = 21 \n" ); document.write( "

Algebra.Com's Answer #175198 by Fombitz(32388) $\"\"$ $\"About$

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Add the equations together.
\n" ); document.write( "4x+5y+4x-5y=51+21
\n" ); document.write( "8x=72
\n" ); document.write( "x=9
\n" ); document.write( "THen use either equation to solve for y.
\n" ); document.write( "4x+5y=51
\n" ); document.write( "4(9)+5y=51
\n" ); document.write( "36+5y=51
\n" ); document.write( "5y=15
\n" ); document.write( "y=3
\n" ); document.write( "(x,y)=(9,3) \n" ); document.write( "

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