Slope of a line based on angles

Question

A Line L1 has slope 2. Lines L2 and L3 have angles of inclination 45 degrees more, and 45 degrees less, respectively, than that of L1. Find the slopes of L2 and L3.

Answer 1

A line with slope = 2 has an angle of inclination of 63.43°.

The line with an angle of inclination 45° less (18.43°) has a slope of 0.34.

The line with an angle of inclination 45° more (108.43°) has a slope of -3.