f(x) = 1 / x
b = 0 (slider from -5 to 5, step 0.5)
g(x) = 1 / (x - b)
gl1: x = b
A: (1, f(1))
B: (2, f(2))
C: (0.5, f(0.5))
D: (-1, f(-1))
E: (-2, f(-2))
F: (-0.5, f(-0.5))
G: (1 + b, f(1))
u = Vector(A, G)
H: (2 + b, f(2))
v = Vector(B, H)
I: (0.5 + b, f(0.5))
w = Vector(C, I)
J: (-0.5 + b, f(-0.5))
a = Vector(F, J)
K: (-1 + b, f(-1))
c = Vector(D, K)
L: (-2 + b, f(-2))
d = Vector(E, L)