I know what an affine plane is .But I don't know how to prove that a plane is an affine plane. Can give me a proof example?
For example, prove that (P,L)is an affine plane:
P is the set of ordered pairs of numbers (x,y)(p.s (x,y)is not equal to (y,x))
L is p(x,y) that satisfying ax+by=c