Question: Decide whether the statement is true or false. Justify your answer. 1. If y is directly proportional to x and x is directly proportional to

Decide whether the statement is true or false. Justify your answer.
1. If y is directly proportional to x and x is directly proportional to z, then y is directly proportional to z.
2. If y is inversely proportional to x and x is inversely proportional to z, then y is inversely proportional to z.
Describe the error.
3. In the equation for the surface area of a sphere, S = 4πr2, the surface area S varies jointly with π and the square of the radius r.

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