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(1 pt) Suppose that \,\chi(s,\, t)\, =\, -4s^2\, -\, 2t^2,\,y\, a function of \,(s,\, t)\, with \, y(1,\, 1)\, =\, 1\, and \, \dfrac{\partial y}{\partial t}\, (1,\, 1)\, =\, -2. Suppose that \, u\, =\, xy,\, v\, a function of \, x,\, y\, with \, \dfrac{\partial v}{\partial y}\, (-6,\, 1)\...