Suppose y varies directly as the square of x and inversly as the cube of w. We know that y=9 when x=2 and w=1. Find y when x=4 and w=2.
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Originally Posted by brianfisher1208 Suppose y varies directly as the square of x and inversly as the cube of w. We know that y=9 when x=2 and w=1. Find y when x=4 and w=2. The first sentence is telling you the following formula is correct (where k is the 'constant of variation'): Use the information in the second sentence to solve for k. Once you know that, you can use the equation to get the answer to the third sentence.
Last edited by pflo; February 26th 2010 at 10:29 PM.
Originally Posted by brianfisher1208 Suppose y varies directly as the square of x and inversly as the cube of w. We know that y=9 when x=2 and w=1. Find y when x=4 and w=2. , so . Substitute and to find . , so . Substitute and to find . Then you should be able to finish the question.
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