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The standard form of a linear equation is y = mx + b
where m is the slop of the line, and b is the y intercept.
If you have two points (x1,y1) and (x2,y2), you can get the slope with the following formula:
m = (y2-y1)/(x2-x1)
if you plug this number in to the equation you can then plug in any (x,y) point on the line to solve for b.
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