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calculus

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f(x,y)=x^2+2y^2
use the gradient vector Þf(5, 1) to find the tangent line to the level curve f(x, y) = 27 at the point (5, 1).
answer choices:
1. 10x + 4y = 27
2. 2x + 4y = 27
3. 5x + 2y = 27
4. 10x − 4y = 27
5. 5x − 2y = 27

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