The value of k, the constant of variation from the given joint variation as evident from the task content is -2.
How to find constant of variation?
a = k × b × c
where,
- a = -42
- b = 7
- c = 3
- k = constant of variation
-42 = k × 7 × 3
-42 = 21k
divide both sides by 21
k = -42 / 21
k = -2
Therefore, the constant of variation, k is -2
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