Concept of Coordinates
This is a system of geometry where the position of points on the plane is described using an ordered pair of numbers.
Recall that a plane is a flat surface that goes on forever in both directions. If we were to place a point on the plane, coordinate geometry gives us a way to describe exactly where it is by using two numbers.
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LENGTH AND MIDPOINT OF A STRAIGHT LINE
The distance between two points
Midpoint formula
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EQUATION OF A STRAIGHT LINE
DEFINITION
THE EQUATION OF A LINE THROUGH THE ORIGIN WITH A GIVEN GRADIENT
THE Y-INTERCEPT OF A LINE
THE EQUATION OF A STRAIGHT LINE WITH GIVEN GRADIENT, PASSING THROUGH A GIVEN POINT
THE EQUATION OF A STRAIGHT LINE THROUGH TWO GIVEN POINTS
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GRADIENT OF PARALLEL AND PERPENDICULAR LINES
Generally, Parallel lines have the same gradient”
the gradient of the perpendicular line is: a1 = -1/2
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