If we define V as the set of vectors in R^2 with vector addition defined as it normally is, but scalar multiplication defined to be k(a,b)=(k2a,k2b), then V is not a vector space. Find all axioms that fail (and explain why they fail).
1. If u and v are objects in V, then u+v is in V.
2. u+v = v+u
4. There is an object 0 in V, called a zero vector for V, such that 0+u=u+0=u for all u in V.
5. For each u in V, there is an object -u in V, called a negative of u, such that u+(-u)=(-u)+u=0.
6. If k is any scalar and u is any object in V, then ku is in V.
The Attempt at a Solution
I couldn't figure out how to start.