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The equation of a straight line is
y = mx + b
Here, y is the vertical axis value (ordinate) and x the horizontal axis value (abscissa).
m is the slope of the straight line and b is the intercept on the y axis when x = 0.
m is determined from any two points on the line as (y2-y1(/(x2-x1)
If you have any two points (x,y) you can solve for b
For example, suppose you have line connecting two points (x,y) at (0,3) and (3,6)
m = (3-0)/(6-3) = 1
at x = 0 y=3 = b
so we have y = mx+b = x + 3
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