This is actually unrelated to the previous problem. But, I think that I have to go through the three properties of an order relation to prove this.
Let x,y is an element in R, real number. We define a relation <= (precedes symbol) on R. Verify that <= (precedes symbol) defined by
x<= (precedes) y if and only if y<= x (less than or equal to)
Verify that <= (precedes symbol) is an order relation.