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.
直线L与y轴相交,设这条线跟xy轴相交的点,分别是(x,0),(0,y),那么L的斜率=(y-0)/(0-x)
条件一:(y-0)/(0-x)=3y,假设不过原点的话,化简得出x=-1/3,只有一个点,无法推断出线的走势,不充分;如果过原点,情况更多了,更加不充分;
条件二:其实就是刚才推出来的式子,只知道一个点,还是不充分;
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