If y varies directly as x, and y is 20 when x is 4, what is the constant of variation for this relation? a) 1/5 b) 4/5 c) 5 d) 16

C) 5

Step-by-step explanation:

The problem tell us that y is directly proportional to x, so we can represent this mathematically by:

Where:

If we evaluate the data provided by the problem, then:

Solving for c, dividing both sides by 4:

Hence, the proportionality constant or the constant of variation is 5

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