MatHS
posted by olgah on .
Determine the angle of inclination
A. X+y+1=0
B.32y =9x

The angle of inclination is always between 0o and 180o and is measured CCW from the positive xaxis.
A. x+y+1 = 0
x+y = 1
Tan A = m = A/B = 1/1 = 1
Ar = 45o = Reference angle.
A = 45 + 180 = 135o.
B. 32y = 9x
9x+2y = 3
Tan A = m = A/B = 9/2 = 4.5
Ar = 77.47o
A = 77.47+180 = 102.5o