y=mx + b is equation of a line. The slope of the line is "m" and the
y-intercept is "b". We can get the equation of the line given the slope
and y-intercept or given two points (x1, y1) and (x2, y2). If given two
points, use the formula (y2 - y1)/(x2 -x1) to find the slope. Then use
the slope and one of the coordinates give to find "b". Then you have
the slope and y-intercept needed to write the equation.

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