In the xy-plane, what is the y-intercept of line l
(1) The slope of line l is 3 times its y-intercept.
(2) The x-intercept of line l is ~$-\frac{1}{3}$~ .
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.
这是一道陷进题
设y=kx+b
(1)y=3bx+b 单独不行
(2)(-1/3,0) 单独不行
联立,看起来好像是可以的,代进去谁知道被约掉了, 0=-b+b, 这样是求不出b的值来的 无语。。。。。。
呃!!!!!!!!!!
看看我上面的解释
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