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Given f(x) = 21x + 12, find f(5)
1 answer:
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Answer:
y = - x
Step-by-step explanation:
Given that y varies directly with x then the equation relating them is
y = kx ← k is the constant of variation
To find k use the condition x = 24, y = - 6
- 6 = 24k ( divide both sides by 24 )
= k , that is
k = -
y = - x ← equation of variation