document.write( "Question 711831: y varies directly as the square of x. When x = 2, y = 40. Find x when y = 640 \n" ); document.write( "

Algebra.Com's Answer #437660 by solver91311(24713) $\"\"$ $\"About$

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varies directly as the square of

so:

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\n" ); document.write( "\n" ); document.write( "Substitute 2 for

and 40 for

. Then solve for

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\n" ); document.write( "\n" ); document.write( "Once you have determined a value for

, substitute that value for

and 640 for

, then solve for

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\n" ); document.write( "\n" ); document.write( "John
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\n" ); document.write( "Egw to Beta kai to Sigma
\n" ); document.write( "My calculator said it, I believe it, that settles it
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$\"The$

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