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Characteristics of k< image 0, image K > 0 and images B > 0 and B < 0.
y=kx+b

The characteristic of K < 0 image is that it must pass through two or four quadrants.

The characteristic of K > 0 image is that it must pass through one or three quadrants.

The characteristic of B > 0 image is that the intersection with Y axis is above X axis.

The characteristic of B < 0 image is that the intersection with Y axis is below X axis.