document.write( "Question 620121: Consider the system of equations: x + y + z = 210; x + z = 230; x + y = 120 What is the value of x? \n" ); document.write( "

Algebra.Com's Answer #389915 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "system of equations: 
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document.write( "x + y + z = 210
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document.write( "x + z = 230 
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document.write( "  y + 230 = 210 , y = -20\r
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document.write( "x + y = 120 
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document.write( "x +(-20) = 120
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document.write( "     x = 140\r
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document.write( "CHECKING our Answer*** Note: z = 90
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document.write( " 140 -20 + 90 = 210
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