If y = x2 - 6x + 9, what is the value of x ?

(1) y = 0

(2) x + y = 3

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

EACH statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are NOT sufficient.

##### 考题讲解

（1）  如果y=0，~$y=x^2-6x+9=(x-3)^2=0$~，则解得x=3，题目得解。

（2）    如果x+y=3，则y=3-x，代入题目中的式子得到，~$3-x=(x-3)^2$~，只根据此式，则x可能为3，也可能为1，均满足条件2，所以，无法根据条件2确定x的值。