SOLUTION: w is directly proportional to z. If w = -6 when z =2,find w when z =-3

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Question 135634: w is directly proportional to z. If w = -6 when z =2,find w when z =-3
Answer by solver91311(24713) About Me  (Show Source):
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Two quantities y and x are said to be in direct proportion if y is given by a constant multiple of x, i.e. y=cx where c is a constant.

So, for your problem w=cz.

You are given that w=-6 when z=2, so -6=2c, or c=%28-6%29%2F2=-3

Now you can write: w=-3z

w for z=-3 is now a simple matter of substitution and arithmetic.