document.write( "Question 369668: Can someone please show me the steps to solving the system x+y=20 and x-y=28, using the substitution method? Thank you! \n" ); document.write( "

Algebra.Com's Answer #263430 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "solving the system x+y=20 and x-y=28, using the 'substitution' method:
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document.write( "1) choose one of the equations to solve for one of the variables
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document.write( "x - y = 28
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document.write( "x = y + 28
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document.write( "2) 'substitute' these findings for x into the other equation x+y=20 
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document.write( "y + 28 + y =20 
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document.write( "solve for y
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document.write( "2y = -8
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document.write( "y = -4
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document.write( "Finding x
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document.write( "x = y + 28 = -4 + 28 = 24
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document.write( "ordered pair( 24,-4) is the point these lines have in common \n" );
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