Question

AOB is a straight line.if a-b=40degree find a and b

Answer 1

AOB is a straight line
therefore => a+b =180 degree .....(i)
=> a-b = 40 degree .....(ii)
By adding (i) &(ii) we get
2a=220 degree
a=110 degree
Substitute the value of a in a+b=180 degree
110 degree +b=180 degree
b =180 degree- 110 degree
b= 70 degree

Answer 2

Solution:

AOB is a straight line  (Given)

∴a+b=180°  (Linear pair)

 a-b=40°    (Given)

 (a+b) + (a-b)=(180°) + (40°)

       2a=220°

         a=110°

       a+b=180°

    110°+b=180°

     b=180°-110°

          b=70°

So a=110° and b=70°