Chapter 11 - Vectors and Vector-Valued Functions - 11.2 Vectors in Three Dimensions - 11.2 Exercises - Page 777: 1

see the details below.

To plot $(3,-2,1)$, starting from the origin, we move three units in the positive direction of $x$-axis, then move two units in the negative direction of $y$-axis and finally, we move one unit in the positive direction of $z$-axis.