Răspuns :
a+b = 29
a-b = 17
a= b + 17
b+ b + 17 = 29
2b = 29 - 17
2b = 12
b = 12 :2 = 6
a = 6 +17 = 23
23 + 6 = 29
23 -6 = 17
a-b = 17
a= b + 17
b+ b + 17 = 29
2b = 29 - 17
2b = 12
b = 12 :2 = 6
a = 6 +17 = 23
23 + 6 = 29
23 -6 = 17