把 x = 3 代入 ax - 8 = 20 + a 得:
3a - 8 = 20 + a
2a = 28
a = 14
把 a = 14 代入 ay + 3 = a - 2y 得:
14y + 3 = 14 - 2y
16y = 11
y = 11/16
把 x = 3 代入 ax - 8 = 20 + a 得:
3a - 8 = 20 + a
2a = 28
a = 14
把 a = 14 代入 ay + 3 = a - 2y 得:
14y + 3 = 14 - 2y
16y = 11
y = 11/16