[[☃ video 1]] What's shown above is the graph of the function $f(x, y) = yx^2 - y^3$ The graph as been sliced along the plane $x = 1$ (pictured in white), which gives a curve in 3d space corresponding to all points on the graph where $x=1$ (pictured in red). What is the slope of the tangent line to this curve at the point $(1, 1, 0)$? [[☃ expression 1]]