Khoảng cách từ giao điểm của hai đường thẳng x - 3y + 4 = 0 và 2x + 3y - 1 = 0

Khoảng cách từ giao điểm của đường thẳng \[x - 3y + 4 = 0\] với trục Ox đến đường thẳng \[\Delta :3x + y + 4 = 0\] bằng:

A.

\[\frac{{16}}{{\sqrt {10} }}\].          

B.

\[\frac{{4\sqrt {10} }}{5}\].

C.

\[\frac{{8\sqrt {10} }}{5}\].

D.

VietJack

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Khoảng cách từ giao điểm của hai đường thẳng x−3y+4=0 và 2x+3y−1=0 đến đường thẳng Δ:3x+y+4=0 bằng:

A. 210 .

B. 3105 .

C. 105 .

D. 2 .

Đáp án và lời giải

Đáp án:C

Lời giải:Lời giải
x−3y+4=02x+3y−1=0⇔x=−1y=1→A−1;1→dA;Δ=−3+1+49+1=210. Chọn C

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