Question

In the given figure

Answer 1

a-2b=30
a+b=180
from this,
-3b=-150
3b=150
b=50
a=130
hope it hope

Answer 2

Happy Independence Day...
a+b=180°
a-2b=30°
Subtracting the two equations gives,
3b=150°
b= 50°
a-2b = 30°
a-100°=30°
a=130°
thank you...