Question: what is the equation for working out the gradient of a line if i know two points on the line? 

Answer: You have two points: (x1, y1) and (x2, y2). By convention, we assume the second point is on the right (in the positive X direction). \n\nCalculate (y2-y1)/(x2-x1). This will be the slope of the line. (you can remember this as "rise over run; rise is higher": ABOVE the line in the division).
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