It's a measure of a line's steepness. Positive slope means upward slant, negative slope means downward, zero slope is horizontal, and undefined slope is vertical.
The equation of a line is y = mx + b. 'm' is slope, 'b' is y-intercept (where it crosses the y-axis).
It's the point where the line hits the y-axis (x=0). Helps find the starting value in linear relationships.
Lines with the same slope are parallel; lines with negative reciprocal slopes are perpendicular.
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