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I'm VERY stuck Vectors A level Chapter 11 watch

Given that c=3i+ 4j and d=i-2j find lambda if lambda c+d is parallel to i +3j
So far I've done lambda
(3i+4j) +i-2j= lambda (i+3j)
So far I've got:
1+lambda= -2-4 lambda
3= -5 lambda
3/-5= lambda
Where have I gone wrong
2. (Original post by Musicanor)
Given that c=3i+ 4j and d=i-2j find lambda if lambda c+d is parallel to i +3j
So far I've done lambda
(3i+4j) +i-2j= lambda (i+3j)
So far I've got:
1+lambda= -2-4 lambda
3= -5 lambda
3/-5= lambda
Where have I gone wrong
1+lambda= -2-4 lambda

I'm not sure where this line comes from

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Updated: November 14, 2017
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