Question

a+b=33 a-b=13 a=? b=?

Answer 1

a+b=33
a-b=13
a=b+13
b+13+b=33
2b=33-13
2b=20
b=10
a=10+13
a=23

Answer 2

daca a-b=13 => a=13+b
inlocuim a in a+b si rezulta 13+b+b=33
13+2b=33
2b=33-13
2b=20
b=20:2
b=10
a=13+b inlocuim b
a=13+10
a=23