document.write( "Question 165479: . For any numbers a and b , a#b= a + b –ab . If a#b = 0, which of the following \r
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\n" ); document.write( "\n" ); document.write( " (A) 2 (B) 1 (C) 0 (D) --1 (E) -3 /2
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Algebra.Com's Answer #121957 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
For any numbers a and b , a#b= a + b –ab . If a#b = 0, which of the following
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\n" ); document.write( "(A) 2 (B) 1 (C) 0 (D) --1 (E) -3 /2
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document.write( "Suppose\r\n" );
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document.write( "\"matrix%281%2C5%2C++%22a%23b%22%2C+%22=%22%2C+a%2Bb-ab%2C+%22=%22%2C+0%29\"\r\n" );
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document.write( "\"a+-+ab+=+-b\"\r\n" );
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document.write( "\"a%281-b%29+=+-b\"\r\n" );
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document.write( "\"a+=+%28-b%29%2F%281-b%29\"\r\n" );
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document.write( "The denominator, \"1-b\" cannot be zero, and it would be if \"b=1\".\r\n" );
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document.write( "So \"b\" cannot equal \"1\".  Choice (B)\r\n" );
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document.write( "Edwin
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