OG(11th)DS-Q039 (Diagnostic Test)

[misia]

In the xy-plane, if line k has negative slope and passes through the point (-5,r), is the x-intercept of line k positive?

(1) The slope of the line k is -5
(2) r>0


答案是E,
有好心人可以指導一下數學白痴的我嗎?

[chour]

請詳圖解
條件1
即使知道斜率,仍有各種可能
條件2
即使知道r>0,仍有各種可能
同時考慮二條件
截距仍有可能為正或負