Question

Two angles are supplementary and the larger is 20 degree less than three times the smaller. Find the angles

Answer 1

Let the two angle be x and y

x+y = 180 .....(1)

Let x be larger angle
x= 3y - 20
x-3y = -20 .......(2)

solving by elimination

x+y =180
x-3y = -20
-  +      +
= 4y = 200
y = 50

x+y = 180
x = 180- 50
x = 130

Answer 2

Answer:

Step-by-step explanation:

Let the two angles be x and y

x+y = 180 .....(1)

Let x be larger angle

x= 3y - 20

x-3y = -20 .......(2)

solving by elimination

x+y =180

x-3y = -20

-  +      +

= 4y = 200

y = 50

x+y = 180

x = 180- 50

x = 130