MatHS

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Determine the angle of inclination
A. X+y+1=0
B.3-2y =9x

  • MatHS -

    The angle of inclination is always between 0o and 180o and is measured CCW from the positive x-axis.


    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. 3-2y = 9x
    9x+2y = 3

    Tan A = m = -A/B = -9/2 = -4.5
    Ar = -77.47o
    A = -77.47+180 = 102.5o

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