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To wrie a equation of any line at least 2 points are required.
now....for writing equation chose any 2 given points.
let . one of them be (X1,Y1) and another be (X2,Y2)
now .....put the values of X1,Y1,X2 and Y2  in this formula and u will get required equation of line.
0 0 0
where:m  is the slope of the line, found using methods described in Slope of a Line (Coordinate Geometry).x and y are the coordinates of any point on the line.
0 0 0
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