document.write( "Question 548839: 2x- y=15
\n" ); document.write( "2x+3y=-13 \n" ); document.write( "

Algebra.Com's Answer #357229 by oberobic(2304) $\"\"$ $\"About$

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2x -y =15
\n" ); document.write( "2x +3y = -13
\n" ); document.write( "--------------- subtract
\n" ); document.write( "-4y = 28
\n" ); document.write( ".
\n" ); document.write( "y = -7
\n" ); document.write( ".
\n" ); document.write( "Substitute y = -7 into one of the equations to find x.
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\n" ); document.write( "2x -(-7) = 15
\n" ); document.write( "2x +7 = 15
\n" ); document.write( "2x = 8
\n" ); document.write( "x = 4
\n" ); document.write( ".
\n" ); document.write( "Check the solution (4,-7) by substituting in the other equation.
\n" ); document.write( "2*4 +(3*-7) = 8 -21 = -13
\n" ); document.write( "Correct.
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\n" ); document.write( "Done. \n" ); document.write( "

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