Think about plotting points in the complex plane to represent the following numbers: -3+8i, 4i, 6, 5-2i. (on the horizontal axis, on the vertical axis, quadrant 1, quadrant 2, quadrant 3, quadrant 4)

For this case we represent in the complex plane numbers of the form:
 a + bi
 Where,
 a: real part
 bi: imaginary part
 We represent the real part on the x axis.
 We represent the imaginary part in the y axis.
 Therefore, for the following numbers we have:
 -3 + 8i: quadrant 2
 4i: on the vertical axis
 6: on the horizontal axis
 5-2i: quadrant 4