Răspuns :
x - y = 16 ⇒ x = y + 16
(x+y) - 16 = 24
x + y = 24 + 16
x + y = 40
y + 16 + y = 40
2y = 40 - 16
2y = 24
y = 24 : 2
y = 12
x = 12 + 16
x = 28
a - b = 16
a + b - 16 = 24
a + b = 24 + 16
a + b = 40
a = 16 + b
16 + b + b = 40
16 + 2 × b = 40
2 × b = 40 - 16
2 × b = 24
b = 24 : 2
b = 12
a = 16 + 12
a = 28