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30 April, 03:55

If the degree measure of an angle is 40 less than 3 times the degree measure of its supplementary angle, what is the degree measure of the angle?

a. 50

b. 55

c. 125

d. 130

+3
Answers (1)
  1. 30 April, 07:21
    0
    The degree measure of angle let being x so than given

    x = 3*y - 40

    y+x = 180 = > y = 180 - x substitute this value of y inside first equation

    x = 3 * (180 - x) - 40

    x = 540 - 3x - 40

    4x = 500

    x = 500/4 = 125

    x = 125 degrees so choice c. is right sure
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