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How do you work out the equation of a line when given the gradient and one point?
m(x-x1) = y-y1
How do you work out the gradient of a line given one point?
(y2-y1)/(x2-x1)
How do you work out the equation of a line given two points?
(y-y1)/(y2-y1) = (x-x1)/(x2-x1)
How do you work out the midpoint of a line?
(x1+x2)/2 , (y1+y2)/2
How do you work out the distance between two points?
v/[(y2-y1) + (x2-x1)]

v/ = square root
What is the general equation to a line?
y = mx + c