Răspuns :
a + b = 44
a - b = 28
a = 28 + b
28 + b + b = 44
28 + 2 × b = 44
2 × b = 44 - 28
2 × b = 16
b = 16 : 2
b = 8
a = 28 + 8
a = 36
a - b = 28
a = 28 + b
28 + b + b = 44
28 + 2 × b = 44
2 × b = 44 - 28
2 × b = 16
b = 16 : 2
b = 8
a = 28 + 8
a = 36