Posted by **JaneLee** on Monday, January 28, 2008 at 12:59pm.

1. If y varies directly as x, and y=30 when x=4, find the constant of proportionality.

2. If y varies inversely as x, and y=2 when x=10, find x when y=4.

3. If a varies jointly as b and c, and a=-10, when b=12 and c=2, find a when b=8 and c=1/2.

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