Răspuns :
8a+10b=106 -
8a+ 6b = 86
------------------
4b = 20
b = 5
8a = 86 - 30
8a = 56
a = 7
8a+ 6b = 86
------------------
4b = 20
b = 5
8a = 86 - 30
8a = 56
a = 7
8a + 6b = 86
8a + 10b = 106 -
---------------------------------
/ -4b = -20
4b = 20
b = 20/4
b = 5
8a + 30 = 86
8a = 86 - 30
8a = 56
a = 56/8
a = 7
8a + 10b = 106 -
---------------------------------
/ -4b = -20
4b = 20
b = 20/4
b = 5
8a + 30 = 86
8a = 86 - 30
8a = 56
a = 56/8
a = 7