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If (y+3)(y-1) – (y-2)(y-1) = r(y-1), what is the value of y?
(1) r2=25
(2) r = 5
AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
CBOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
DEACH statement ALONE is sufficient.
EStatements (1) and (2) TOGETHER are NOT sufficient.
正确答案 E
条件1 5(无限解)或者-5
条件2 5(无限解)
条件1+2 无限解
为什么是无限解,Y直接都约没了,Y是几跟R也没关系,有没有人能解释详细一点的?谢谢 |
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