TTGWD9-5

Q5:

If x and y are positive integers and y = 根号下(9-X)what is the value of y?

(1)     x < 8

(2)     y > 1

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

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

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

D. EACH statement ALONE is sufficient.

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

Answer:D

我知道1可以，2怎么行呢？他让求Y的值啊

如果y>1的话,y只能等于２，所以Statement (2) ALONE is sufficient

y>1, 则y可能等于2,3,4....

又y=根号下(9-x),而且x,y都是正整数, 那么y必须等于2 (x=5);否则, y=3, x=0; y=4, x=-7;y=5, x=-16....都不对了