line
Slope‐intercept form.
y = mx + c. The line has a gradient m and intercept at (0,c). For a vertical line the gradient is infinite and the equation is x = k (in this case there is no intercept on the y-axis).
Two‐point form.
The condition that the general point P(x,y) lies on the line through A(x1,y1) and B(x2,y2) is equivalent to requiring the gradient of AP = the gradient of 
Point‐slope form.
A line with gradient m passing through the point A(x1,y1) has equation y−y1 = m(x−x1).
Two‐intercept form.
When the equation is written as 
the line cuts the axes at (a,0) and (0,b), making it very easy to draw the line.
- probability measure
- probability paper
- probability space
- probability vector
- probable error
- product
- product group
- product moment correlation coefficient
- product notation
- product of inertia
- product rule
- product set
- product space
- program
- progression
- projectile
- projection
- projection
- projective geometry
- projective space
- projective transformation
- prolate
- proof
- proof by contradiction
- proof theory