In this video the instructor shows how to find the equation of the line given its slope and a point that lies on it. If the slope of the line is m and the point that lies on it is (x,y) then you can find the equation of the line by substituting the values in the slopeintercept form of an equation which is y = mx + b. Now substitute the values in the above equation and solve it for the value if the yintercept y. Now you have the slope m and y intercept b. Substitute these values in the general equation y = mx + b which gives you the equation of the line. If instead you are given two points then first find out the slope which is the ratio of difference of ycoordinates to the difference of xcoordinates. This video shows how to find the equation of a line.
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