jackchung asked in 社會與文化語言 · 1 decade ago

GMAT-problem solving(數學-5)

In the xy-plane, line k has positive slope and x-intercept 4.

If the area of the triangle formed by line k and the two axes is 12,

what is the y-intercept of line k ? Ans: (A)

(A) -6

(B) -4

(C) -3

(D) 3

(E) 6

詳解 謝謝

1 Answer

Rating
  • 烏莉
    Lv 5
    1 decade ago
    Favorite Answer

    譯:

    xy平面上,已知直線k與x軸交於4且斜率為正

    (positive slope即斜率為正)

    若直線k與二軸圍成的三角形面積是12

    問直線k與y軸交於何處?

    解:

    設直線k的y截距為a

    a×4÷2=12

    →a=6

    因斜率為正

    ∴直線k交y軸於-6#

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