In a Linear equation in 2 variables(i) Lines Passing Through the OriginCertain linear equations exist such that their solution is (0,0). Such equations when represented graphically pass through the origin.The coordinate axes x-axis and y-axis can be represented as y=0 and x=0 respectively.(ii) Lines Parallel to Coordinate AxesLinear equations of the form y=a, when represented graphically are lines parallel to the x-axis and a is the y-coordinate of the points in that line.Linear equations of the form x=a, when represented graphically are lines parallel to the y-axis and a is the x-coordinate of the points in that line.