Sketch the level curves of the function corresponding to each value of z. f(x, y) = 9x² + y; z = -2, -1, 0, 1, 2 y -3 -2 -1 -3 -2 O -6 -8 -10 1 2 1 3 X 2 3 00 X -3 -2 y y 10 V V -1 -1 y 2 -2 A -4 -6 -8 -3 -2 -1 -10 -2 2 3 3 X X

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