Section+8.2

8.2



Evan is being interrogated by Jackie. Basically he got a problem wrong in math class, and he is looking into his past so he does not make that mistake again.

Example 1: If y is inversely proportional to x, and y=6 when x=5, find x when y=12. View the video to see how to solve. media type="custom" key="8688910"

Example 2: Suppose that w varies directly as z^2 (squared) and inversely as xy, and that w=10 when x=15, y=2, and z=5. Find z when w=2, x=8, and y=27. media type="custom" key="8703984"

Example 3: To set up the problem you need to know: ~ the measure lux is for the intensity of light. Lux is inversely proportional to the square of the distance between the light source and the object illuminated.

Problem: A light meter 7.5 m from a light source registers 24 lux. What intensity would i register 15 m from the light source?

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Worksheet: