The greater the absolute value of k of a straight line, the closer it is to the Y axis, so you will find that they are around the Y axis after drawing, so their right part can only be greater than or equal to 1, and their left part can only be less than or equal to -3.

The endpoint coordinates of line segment AB are A (-2,4) and B (4 4,2), and the intersection of straight line y=kx-2 and Y axis is P (0 0,2). It always intersects the line segment AB, as long as the slope of the straight line y=kx-2 is not less than the slope of the straight line PB or less than the slope of the straight line PA, and PB = 1.

from/question _ 5035 1832 . htm