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OpenStudy (anonymous):
Suppose y varies jointly with x and z, and x = 4 when y = 8 and z = -2.What is the value of x when y = 12 and z = 3?
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OpenStudy (psymon):
Varies jointly or directly (same thing) means you have the equation of y = kx. In this case, though,y varies jointly with x and z, so you have y = kxz. The first job is to find k, which you will solve for by plugging in the first 3 numbers given. Once you find k, you can plug in the final numbers to solve for x.
OpenStudy (anonymous):
|dw:1375327276931:dw| @Psymon
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