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 xaxis is y = a, and that of
a line parallel to yaxis is x = b. Equation of a line passing through the points A(x_{1} , y_{1}) and B(x_{2} , y_{2}) is : (x  x_{1}) (y_{2}  y_{1}) = (y  y_{1}) (x_{2}  x_{1})
where (x_{1} , y_{1}) are coordinates of point A and (x_{2} , y_{2}) are the coordinates of point B.
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