Question 980602
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Here's one exactly like yours with the numbers changed:
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Find 3a+b given: a= <-2,5>,  b=<3,7>.
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Substitute:

3   a   +   b
|   |   |   |
3<-2,5> + <3,7>
<-6,15> + <3,7>
    <-3,22> 

Now do yours exactly the same way.

Edwin</pre>