Sketch the level curves of the function z(x, y) = 10- 9 8 7 6 5 4 3 -10 -9 -8 -7 -6 -4-3-2 2 4 5 6 8 9 10 -2 -3 -5 -6 -7 -8 -9 -10- x = for c = -5. x + y

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