For vectors given in a component form linear combinations are also performed by components.
`u= lt-5,3gt,` `v= lt0,0gt,` therefore
(a) `u+v = lt-5+0,3+0gt = lt-5,3gt,`
(b) `u-v = lt-5-0,3-0gt = lt-5,3gt,`
(c) `2u-3v = lt2*(-5)+(-3)*0,2*3+(-3)*0gt = lt-10,6gt.`
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