document.write( "Question 885053: y varies jointly as a and b, and inversely as the square of c. y=64 when a=14, b=8, and c=4. Find y when a=7, b=4, and c=8.\r
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\n" ); document.write( "\n" ); document.write( "would the answer be:
\n" ); document.write( "y=(32/2.8) \n" ); document.write( "
Algebra.Com's Answer #534900 by MathTherapy(10552)\"\" \"About 
You can put this solution on YOUR website!

\n" ); document.write( "y varies jointly as a and b, and inversely as the square of c. y=64 when a=14, b=8, and c=4. Find y when a=7, b=4, and c=8.
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document.write( "\"y+=+kab%2Fc%5E2\"\r
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document.write( "\"64+=+k%2814%29%288%29%2F4%5E2\" ------ Substituting 64 for y, 14 for a, 8 for b, and 4 for c, to determine k 
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document.write( "\"64+=+112k%2F16\" 
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document.write( "112k = 64(16) ------ Cross-multiplying
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document.write( "\"k+=+%2864%2816%29%29%2F112\", or \"k+=+%2864%28cross%2816%29%29%29%2F7cross%28112%29\"_____\"64%2F7\"\r
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document.write( "\"y+=+kab%2Fc%5E2\"
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document.write( "\"y+=+%28%2864%2F7%29%287%29%284%29%29%2F8%5E2\" ------ Substituting 7 for a, 4 for b, and 8 for c
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document.write( "\"y+=+%28%2864%2F7%29%287%29%284%29%29%2F64\"_____\"y+=+%28%28cross%2864%29%2Fcross%287%29%29%28cross%287%29%29%284%29%29%2Fcross%2864%29\" 
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document.write( "\"highlight_green%28highlight_green%28y+=+4%29%29\"
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document.write( "You can do the check!! \r
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document.write( "Send comments, “thank-yous,” and inquiries to “D” at MathMadEzy@aol.com.
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