Coordinate Geometry

Cartesian coordinate
(x,y)
Gradient
m=\dfrac{y_1-y_2}{x_1-x_2}
Equation
y-y_1=m(x-x_1)
y=mx+c
*Vertical line: x=a
*Horizontal line: y=b
Length
\text{Length } = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}
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