Question

Find the Inclination of a line with a slope of m:
m = -4

Options:
A. - 1.158 radian(s) or - 66.338 degrees
B. - 1.816 radian(s) or - 104.036 degrees
C. 1.816 radian(s) or 104.036 degrees
D. - 1.326 radian(s) or - 75.964
E. 1.326 radian(s) or 75.964 degrees

Answer 1

Use arctan or inverse tan, whichever you call it.

Answer 2

we can draw a pic to satisfy your question, and we find the line go pass the point (1,-4). So the degree is \[\tan^{-1}(-4) =-75.964 degree\]
which is D or C(because 180-75.964=104.036)