document.write( "Question 1056244: For the following problem, y varies directly as x.\r
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Algebra.Com's Answer #671417 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
y varies directly as x.
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document.write( "\"y\"\"%22%22=%22%22\"\"k%2Ax\"\r\n" );
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\n" ); document.write( "If y = 25 when x = -15,
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document.write( "Substitute that in\r\n" );
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document.write( "\"25\"\"%22%22=%22%22\"\"k%2A%28-15%29\"\r\n" );
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document.write( "Solve for k\r\n" );
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document.write( "Multiply both sides by -15\r\n" );
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document.write( "\"25%2F%28-15%29\"\"%22%22=%22%22\"\"k\"\r\n" );
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document.write( "\"-5%2F3\"\"%22%22=%22%22\"\"k\"\r\n" );
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document.write( "Substitute that in \r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"k%2Ax\"\r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"expr%28-5%2F3%29x\"  <-- that's the formula\r\n" );
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\n" ); document.write( "find x when y is 10.
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document.write( "Substitute 10 for y\r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"expr%28-5%2F3%29x\"\r\n" );
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document.write( "\"10\"\"%22%22=%22%22\"\"expr%28-5%2F3%29x\"\r\n" );
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document.write( "Multiply both sides by 3\r\n" );
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document.write( "\"30\"\"%22%22=%22%22\"\"-5x\"\r\n" );
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document.write( "Divide both sides by -5\r\n" );
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document.write( "\"-6\"\"%22%22=%22%22\"\"x\"\r\n" );
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document.write( "Edwin
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