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find (a)2v+u, (b)u-3v), and (c)5u-v.

1.u=i-j, v=6i+9j
2.u=2i+3j, v=-i-2j

1 answer

These are just multiply, group, and combine. For instance,
2a: 2v+u=2(i-2j)+(2i+3j)=2i+2i-4j+3j=4i-j
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