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..., the equation of a line given two points?
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Points (p,v) and (h,k)
slope
Choosing (h,k) and the expression for slope, line contains points (x,y):
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and you can go one or two steps further, to put into form y=mx+b;
where m is slope and b is y-intercept. Specific examples for the two given points can be simplified into the specific equation.