Find a possible equation for a linear function with the given contour diagram. y 3 2 1 -1 -2 ti -3 -3 -2 -1 1 2 3 h(x, y) = 2 + x - 2y h(x, y) = 4 + 2x - 2y h(x, y) = 4 + x - y h(x, y) = 4 + 2x - y h(x, y) = 4 + x + y I