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TIMESTAMPS
00:00 Straight lines on the cartesian plane
00:47 Gradients, runs, and rises
01:50 How to calculate a gradient
04:11 How to calculate a negative gradient
04:51 Horizontal gradients
05:36 Vertical gradients
06:27 Relation between gradients of parallel and perpendicular lines
07:22 Equations of straight lines, Y intercepts, and X intercepts
09:55 Example: solve the equation of a line given two coordinates