physics vectors

Consider the two vectors A with arrow = 3 i − j and B with arrow = − i − 6 j.
Calculate the directions of A with arrow + B with arrow and A with arrow − B with arrow.

A with arrow + B with arrow ° (counterclockwise from the +x axis)
A with arrow − B with arrow ° (counterclockwise from the +x axis)

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  1. A+B = 2i-7j
    tanθ = -7/2 in QIV

    A-B = 4i+5j
    tanθ = 5/4 in QI

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