Question

please help me by solving this question

Answer 1

2a-3b=60
given a+b=180
put a =180-b
2(180-b)-3b=60
360-2b-3b=60
360-60=5b
5b=300

Answer 2

supplementary angles means the sum is 180 so we get one equation as A+B =180
and other from question
2A-3B =60
so putting value of A in second equation fron equation 1
2(180-B) -3B =60
360-2B-3B=60
5B=300
B=60
A=180-60=120