Lesson#12 <br />How to write equation of straight line? (3) <br />CASE 3: If two points of a non-vertical line are given, we will use <br />Two Point From: y - y1 = y2 - y1/x2 - x1 (x - x1) <br />We may write this formula in determinant from as <br />|x y 1| <br />|x1 y1 1| = 0 <br />|x2 y2 1| <br />Math.EX4.3 Part 12 <br />Theorem: Equation of a non-vertical straight line passing through two points Q(x1 , y1) and R(x2 , y2) <br />Proof: <br />Given: Q(x1 , y1) and R(x2 , y2) are two points on the line. <br />let P(x , y) be an arbitrary point of the straight line. <br />Slope of PQ = Slope of QR = Slope of PR <br />Introduction to Analytical Geometry <br />Chapter No 4 <br />Exercise No 4.3 <br />Mathematics <br />part 2
