damaentan25022003 damaentan25022003 30-12-2022 Mathematics Answered Let f (x, y) be a differentiable function of two variables. Suppose that f (1, 3) = 7 and ∇f (1, 3) = (1, 1). Find an equation for the tangent line to the 7-level curve of f at the point (1, 3).