174. 17336-!-item-!-187;#058&011114
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 - 1/3.
ANS: E
可是我算C
設l 為y=ax+b
由(2)通過(-1/3, 0)則 -1/3a+b=0
由(1)a=3b
這樣不就算出來了嗎?
唉...我是那邊又算錯呢?
請各位高手多多幫忙,謝謝!