1. Find Collinear vectors
`A=(0,2)`, `B=(0,4)`

Solution:
Here `vec A=(0,2),vec B=(0,4)`

Two vectors `vec A` and `vec B` are collinear if there exists a number n such that `vec B = n * vec A`

Find the first nonzero coefficient of vector `vec A`

`A_2=2`

`n=B_2/A_2=4/2=2`

`2 * vec A`

`=2*(A_1,A_2)`

`=(2*A_1,2*A_2)`

`=(2*0,2*2)`

`=(0,4)`

`=vec B`

Since `vec B = 2 * vec A`, so vectors are collinear.

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