Answer
No, subtraction is not commutative.
Work Step by Step
Subtraction is not commutative so the order that the equation is in makes a difference for the answer. If you apply values to the vectors, you can see how the order of their subtraction matters.
Example:
a=5
b=10
a-b (5)-(10)=-5
b-a (10)-(5)=5
-5$\ne$5
