I thought the convention would be vector A- vector B= vector A + (- vector B), o

Question

I thought the convention would be vector A- vector B= vector A + (- vector B), or 3.00units + (-4.0)units = -1.0 units.
but this isn't the same as the answer provided in the solutions manual. I also don't understand how the graph got flipped if vector A is along the positive x-axis and vector B is along the negative Y axis. thanks. I also don't understand how to know which angle I am measuring in order to find the direction of vector addition/subtraction.
but this isn't the same as the answer provided in the solutions manual. I also don't understand how the graph got flipped if vector A is along the positive x-axis and vector B is along the negative Y axis. thanks. I also don't understand how to know which angle I am measuring in order to find the direction of vector addition/subtraction.

Explanation / Answer

http://zonalandeducation.com/mstm/physics/mechanics/vectors/vectors.html http://zonalandeducation.com/mstm/physics/mechanics/vectors/componentAddition/componentAddition2.htm

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