document.write( "Question 1190677: 2x+y=-4
\n" ); document.write( "x+y=-7
\n" ); document.write( "Find the first variable and isolate it. Then solve for that variable.
\n" ); document.write( "solve for the second variable
\n" ); document.write( "find the numerical value of the first variable.
\n" ); document.write( "(when I say the first variable it's any variable that you would want to start with...that's what my teacher said)
\n" ); document.write( "I don't really understand how to do this so could somebody please explain \n" ); document.write( "

Algebra.Com's Answer #822668 by MathTherapy(10552) $\"\"$ $\"About$

You can put this solution on YOUR website!
2x+y=-4
\n" ); document.write( "x+y=-7
\n" ); document.write( "Find the first variable and isolate it. Then solve for that variable.
\n" ); document.write( "solve for the second variable
\n" ); document.write( "find the numerical value of the first variable.
\n" ); document.write( "(when I say the first variable it's any variable that you would want to start with...that's what my teacher said)
\n" ); document.write( "I don't really understand how to do this so could somebody please explain
\n" ); document.write( "

That person's WRONG!!  
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document.write( "2x + y = - 4 ----- eq (i)
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document.write( "x + y = - 7____x = - 7 - y ---- eq (ii)
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document.write( "2(- 7 - y) + y = - 4 ----- Substituting - 7 - y for x in eq (i)
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document.write( "- 14 - 2y + y = - 4
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document.write( "- y = 10
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document.write( "x = - 7 - (- 10) ------- Substituting - 10 for y in eq (ii)
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