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Use the the tip-to-tail method.
A scalar multiplication of a vector by a negative number (other than -1) means to change the magnitude and also to reverse the direction.
We are given the two vectors u and v in a coordinate plane.
We want to show the addition of those two vectors graphically. We will label the addition vector as w.
Finally, we will draw a directed line segment from initial point of v to the terminal point of u to show the addition vector w.
This time we will find a scalar multiplication of the vector w by a number -0.5.