(1,2) বিন্দুগামী 3x + 2y + 5 = 0 রেখার উপর লম্বরেখার সমীকরণ কোনটি?
ক
2x + 3y - 8 = 0
খ
3x - 2y + 1 = 0
গ
3x + 2y - 7 = 0
ঘ
2x - 3y + 4 = 0
সঠিক উত্তর: 2x - 3y + 4 = 0
The perpendicular line upon 3x + 2y +5 = 0 is 2x - 3y + k = 0 which is gone through (1,2), so, 2×1-3×2+k = 0 or, k=4 so, 2x - 3y + 4 = 0