8.2

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Section 8.2 - Inverse and Joint Variation Inverse and Joint Variation ( page 360 #1-10 ) Word Problems ( page 361 #1-8 )

[[image:mathpic.jpg width="333" height="337" align="right"]] ** Example #1) If y varies inversely as x, and y=3 when x=6, find x when y=18. **
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** Example #2) If z is jointly proportional to x and y, and z=18 when x=0.4 and y=3, find z when x=1.2 and y=2. **

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** Example #3) The frequency of a radio signal varies inversely as the wave length. A signalof frequency 1200 kilohertz (kHz), which might be the frequency of an AM radio station, has wave length of 250 m. What frequency has a signal of wave length 400 m? **

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