Suppose an insect lands on a sheet of graph paper at a point located 12 cm to
the right of the left edge and 8 cm above the bottom edge and walks slowly
to a point located 7 cm from the left edge and 4 cm from the bottom edge.
Choose the rectangular coordinate system with the origin at the lower left-side
corner of the paper and find the displacement vector of the insect. Use a ruler,
a graph paper and make use of graphical representation of vectors