Question

2 angles are supplementary angles and larger is 20 degrees less than 3 times the smaller , find the angles

Answer 1

let the small angle =xerox
other =3x-20
3x-20+x=180
4x=200
x=50
3x-20=150-20=130
I hope this helps you

Answer 2

x + y = 180 ( Supplementary angles )

Let y be the larger angle

y = 3x - 20

x + (3x - 20) = 180 (Substituting the values)

4x - 20 = 180

4x = 200

x = 50

So, y = (3 × 50) - 20

y = 130

Aliter : You can also subtract 50 from 180 and get the value of y

Hope it helps !!!