Can someone help with my algebra question?

135 degrees

Step-by-step explanation:

let the inclination be theta.

Here, theta is the angle made by line AB in a positive direction.

So, 0 + 45 = 180

or, 0= 180-45

Therefore, 0=135

Hence, The inclination is 135

( Im not sure with my answer so check it yourself plz. The answer could be 45 degrees too)

(same book btw look at pg 142 example 1)