Very simple. You just use the vectors as normal numbers, and multiply the coordinates with 2 and 4 like this:
2*u = 2* (2,4) = (4,8)
4*w = 4* (-1,3) = (-4,12)
(4,8) - (-4,12) = (8,-4)
So the vector has the coordinates (8,-4)
Im not quite sure but i think the unit rate is 150. Hope this helps!!
431.2 is the answer to your question
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3/6x+9=8
3x+9=8
3x=-1
x= -1/3
