Vectors

[Chi]

I don’t understand the method to work out the answer for part b

 

[Dr.Peterson]

You have parallel vectors 6i + 4j and (λ + 2)i + 1j. You can't say, as you did, that 1 = 4! Rather, you can say that

(λ + 2)/6 = 1/4,​

since the ratios of components must be equal for parallel vectors. Another way to say it would be that

(λ + 2)i + 1j = k(6i + 4j), so λ + 2 = 6k and 1 = 4k, for some nonzero real number k.​

 

[Chi]

I understand now, just made a silly mistake I couldn’t spot .Thank you very much