document.write( "Question 87524: Solve by substitution 3x -y =-7 and x+ y = -9 \n" ); document.write( "

Algebra.Com's Answer #63484 by checkley75(3666) $\"\"$ $\"About$

You can put this solution on YOUR website!
3X-Y=-7
\n" ); document.write( "-Y=-3X-7
\n" ); document.write( "Y=3X+7 NOW SIBSTITUTE (3X+7) FOR X IN THE OTHER EQUATION
\n" ); document.write( "X+(3X+7)=-9
\n" ); document.write( "X+3X+7=-9
\n" ); document.write( "4X=-9-7
\n" ); document.write( "4X=-16
\n" ); document.write( "X=-16/4
\n" ); document.write( "X=-4 ANSWER.
\n" ); document.write( "3*-4-Y=-7
\n" ); document.write( "-12-Y=-7
\n" ); document.write( "-Y=-7+12
\n" ); document.write( "-Y=5
\n" ); document.write( "Y=-5 ANSWER. \n" ); document.write( "

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