A line is passing through the points (1,3) and (5,7), then its inclination is

The angle made by the line with  x- axis in the positive direction is called inclination of the line. If θ0∘≤θ<180∘ be the inclination of a line then the slope of the line is m=tan⁡θ The slope of the line joining two points x1,y1 and x2,y2 is m=y2−y1x2−x1Therefore, tanθ=y2−y1x2−x1=7−35−1=44=1 It implies that θ=45∘