The absolute value of k determines the degree of inclination, and the sign of k determines whether it rises or falls from left to right, that is, when k >: 0, hours increase, k < 0, decreases!

B is the ordinate of the intersection of a straight line and the Y axis, and when b >; 0, the intersection with the Y axis is above the origin, and when b=0, the straight line passes through the origin; When b < 0, the intersection with the y axis is below the origin.