y=mx+c is the equation of a straight line where m is the slope.

m = tanθ where θ is the angle made by the line with the x-axis.

When you are given the equation of a straight line,

first rewrite the equation in the form y = mx+c,

find m, then the angle made by the line with the x axis is

given by

**"Show how you can calculate the angles between a straight line (right angle) and the x-axis by using the lines arch(?) and a trigonometric connection"**