document.write( "Question 1131090: David is thinking of two numbers. Their sum is 5. Their difference is 349. What are the two numbers? \n" ); document.write( "

Algebra.Com's Answer #747691 by rothauserc(4718) $\"\"$ $\"About$

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1) x + y = 5
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\n" ); document.write( "2) x - y = 349
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\n" ); document.write( "add equations 1 and 2 together
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\n" ); document.write( "2x = 354
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\n" ); document.write( "x = 177
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\n" ); document.write( "substitute for x in equation 1
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\n" ); document.write( "177 + y = 5
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\n" ); document.write( "y = -172
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\n" ); document.write( "the two numbers are 177, -172
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\n" ); document.write( "check the answer using equation 2
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\n" ); document.write( "177 -(-172) = 349
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\n" ); document.write( "177 + 172 = 349
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\n" ); document.write( "349 = 349
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\n" ); document.write( "answer ok
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