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13 cards from this deck
Straight lines
The steepness of a line
mmm
m=y2−y1x2−x1m = \frac{y_2 - y_1}{x_2 - x_1}m=x2−x1y2−y1
Slopes upward from left to right
Slopes downward from left to right
Horizontal line (parallel to x-axis)
Vertical line (parallel to y-axis)
The gradient
The y-intercept
x=ax = ax=a
y=by = by=b
px+qy+r=0px + qy + r = 0px+qy+r=0
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