Use the chain rule to find and where 8z მs Ət' First the pieces: dz 2x+y 品 di მs dy 88 4 9 And putting it all together: this context 10x + 22y 24x + 27y Əz მა дz Ot 8z dy = 81 Ot ду 24 x + 2y 7 = 10 Variable 'x' is not defined in z = x² + xy + y², x = 4s + 7t, y = 9s + 10t

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