Question

x and y are angles on a triangle l forming linear pairs.If twice of x is less than 30° less than y,Find x and y.

Answer 1

x=15 °
y=65°
as, 2x=30 degree
x=30/2
x=15 degree
x+y=180 degree (linear pair)
15 degree + y = 180 degree
y=180 degree -15 degree
y=65 degree
so,x =15 degree and y=65 degree
this may help you better!

Answer 2

2x =y-30
 x = y-30/2
  y = 2x+30
x+y = 180                  ( adjacent angle add upto 180)
x + 2x + 30 = 180
 3x +30 = 180
  x+10 =60
   x = 50
2x =y -30
 100 + 30 = y
 y =130
 ANS) x=50
          y= 130