Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.1 Surfaces and Level Curves, #28 · Multivariable Calculus · Partial derivatives

Let … be the driving time from your home at … to…

Let $T (x, y)$ be the driving time from your home at $(0, 0)$ to nearby towns at $(x, y)$ . Draw the level curves.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.1 Surfaces and Level Curves, #28

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