This is a free lesson from our course in Algebra I In this lesson we take a look at how to write the equation of a line passing through two given points. It also explains and graphs the equations of coordinate axes and equations of lines parallel to the coordinate axes. Generally speaking, the equation of a line parallel to x-axis is y = a, and that of a line parallel to y-axis is x = b.Equation of a line passing through the points A(x1 , y1) and B(x2 , y2) is : (x - x1) (y2 - y1) = (y - y1) (x2 - x1) where (x1 , y1) are coordinates of point A and (x2 , y2) are the coordinates of point B.
Other useful lessons:
 Calculating equation of a line from point and slope Calculating equation of a line from slope and intercept Calculating equation of a line from point and intercept Determine whether a point lies on a line
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