x = 8
y = 4
Объяснение:
y + x = 12
x - y = 4
x = 12-y
12 - y - y = 4
12 - 2y = 4
-2y = 4 - 12
-2y = -8
x = 12 - 4
x = 8
y = 4
Объяснение:
y + x = 12
x - y = 4
x = 12-y
12 - y - y = 4
x = 12-y
12 - 2y = 4
x = 12-y
-2y = 4 - 12
x = 12-y
-2y = -8
x = 12-y
y = 4
x = 12 - 4
x = 8