Parallel and orthogonal

I need math help in this problem: a=(-5, 5 3) b=(-2,-4,-5) (they are vectors)
Decompose the vector b into b=v+w where v is parallel to a and w is orthogonal to a, find v and w

Correct result:

v1 =  2.1186
v2 =  0
v3 =  0
w1 =  0
w2 =  0
w3 =  0

Solution:

a=(5,5,3) b=(2,4,5)  b=v+w va=>v=ka  wa=>w.a=0   2=v1+w1 4=v2+w2 5=v3+w3 v1=5 k=2.1186 v2=5 k v3=3 k w1 (5)+w2 5+w3 3=0  v1+w1=2 v2+w2=4 v3+w3=5 5k+v1=0 5kv2=0 3kv3=0 5w15w23w3=0  k=25590.423729 v1=125592.118644 v2=125592.118644 v3=75591.271186 w1=243594.118644 w2=111591.881356 w3=220593.728814
v2=0v_{2}=0
v3=0v_{3}=0
w1=0w_{1}=0
w2=0w_{2}=0
w3=0w_{3}=0



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