# Find the angle between x-axis and the line joining the points(3, -1) and (4, -2).

Let the given points be A(3, -1) and B(4, -2)

Here mAB = = = -1

Also slope of x-axis, m = θ

Let θ be the angle between these two lines.

Then tanθ =

or tanθ = = 1

or θ = 450

Now obtuse angle = 1800 – 450 = 1350

Hence, the angle between x-axis and the given line is 1350.

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