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AI-লিখিত অনুমানভিত্তিক উত্তর—ধারণা ও সীমাবদ্ধতা নিচে উল্লেখ করা হয়েছে। এটি উৎসের যাচাইকৃত মূল উত্তর হিসেবে দাবি করা হচ্ছে না।

স্পষ্ট অনুমান: The coordinates of point P are represented generally as $P(x_1, y_1)$ due to missing data in the original exam question stem. | The line AC is extraneous information unless P was defined as a particular point on AC, which is unspecified.

Given line AB:
$y = 2x + 1$
$\Rightarrow 2x - y + 1 = 0$

The slope of line AB is $m_1 = 2$.
Let the perpendicular line have slope $m_2$. Since the lines are perpendicular:
$m_1 \cdot m_2 = -1 \Rightarrow m_2 = -\frac{1}{2}$

Thus, the general equation of any line perpendicular to AB is:
$x + 2y + k = 0$

Since the specific coordinates of point P are omitted in the question, let $P = (x_1, y_1)$.
Substituting $P(x_1, y_1)$ into the equation:
$x_1 + 2y_1 + k = 0 \Rightarrow k = -(x_1 + 2y_1)$

Therefore, the required equation of the perpendicular from P on AB is:
$x + 2y - (x_1 + 2y_1) = 0$

[Note: If P were specifically the origin $(0, 0)$, the equation would be $x + 2y = 0$.]