Gradient = up divided by across The gradient of a line with points (-2,0) and (0,2), 2 divided by 2 = 1 This is a 45 degree line
A = (x1,y1) B = (x2,y2) The gradient of AB is y1 - y2 divided by x1 -x2 or y2 - y1 divided by x2 - x1
dy/dx means the gradient of a line
Perpendicular is the same as normal The normal of dy/dx 2 is -1/2
The normal of dy/dx x/y is -y/x x = 2 y = 1
Two lines with equal gradients are parallel
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