b=%v

a=%v

a+b=b+a=%v

B = (1, 2)
C = (4, -1)
D: B + C
b_2 = Vector(B, D)
a_2 = Vector(C, D)
A = Intersect(xAxis, yAxis)
a = Vector(A, B)
b = Vector(A, C)
c = Vector(A, D)