A1 = 1
A2 = 5
A3 = 2
A4 = 8
A5 = -2
B1 = -1
B2 = 2
B3 = 3
B4 = 4
B5 = 1
P_1: (A1, B1)
P_2: (A2, B2)
P_3: (A3, B3)
P_4: (A4, B4)
P_5: (A5, B5)
lista1: {P_1, P_2, P_3, P_4, P_5}
a = FitLineY({P_1, P_2, P_3, P_4, P_5})