[問題] GWD 5-26

[happyjoy]

Q26:
In the xy-plane, the line with equation ax + by + c = 0, where abc ≠ 0, has slope . What is the value of b?
(1) a = 4
(2) c = −6

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

斜率的東西快要忘光光了...請大家指點一下這題的思路 ~ 謝謝!

[小紅豆]

y=ax(斜率)+b(截距) ----.斜截方程式
y=-(a/x+c/b)

我想這是考斜截方程式

[twkevin]

Q26:
In the xy-plane, the line with equation ax + by + c = 0, where abc ≠ 0, has slope . What is the value of b?
(1) a = 4
(2) c = −6

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

斜率的東西快要忘光光了...請大家指點一下這題的思路 ~ 謝謝!

建議大家可以先看看OG前面數學公式再開始作題
數學的基本功在那裡
斜率公式 y=mx+b, m斜率,b常數