y' =

xmin = -4 (slider from -10 to 10, step 0.1)
xmax = 6.2 (slider from -10 to 10, step 0.1)
ymin = -3.4 (slider from -10 to 10, step 0.1)
ymax = 4 (slider from -10 to 10, step 0.1)
f(x, y) = ((0.35 * y) * (4 - y))
n = 26 (slider from 10 to 100, step 1)
a = 0.7 (slider from 0.1 to 1, step 0.1)
F = SlopeField(f(x, y), n, a, xmin, ymin, xmax, ymax)
Textfeld1 = Textfield(f)
b = 0.8 (slider from -5 to 5, step 0.1)
NumerischesIntegral1 = Locus(F, (1, b))