Question

Angles a and b form a linear pair of angles and a-b = 30 then find the value of a

Answer 1

a - b is 30 and we know that a+b is 180 as it is linear pair, so a is 105 and be is 75.

Answer 2

let a=x and b=x+30(we write b=x+30 because in a-b=30, then a=30+b)
so
x+x+30=180
2x=180-30
x=150/2=>75
hence a is 75