iran-konkur 2022 Q109

iran-konkur · Other · konkur-riazi_1401_specialized Straight Lines & Coordinate Geometry Point-to-Line Distance Computation
109. The distance of point $A$ from the line $x + y = a$ is $a$. The two points $B(-3, 2)$ and $C(-1, 4)$ are on this line, and $5$ is the distance. What is the value of $a$?
(1) $2$ (2) $\dfrac{1}{2}$ (3) $-\dfrac{1}{2}$ (4) $-2$
\textbf{109.} The distance of point $A$ from the line $x + y = a$ is $a$. The two points $B(-3, 2)$ and $C(-1, 4)$ are on this line, and $5$ is the distance. What is the value of $a$?

(1) $2$ \qquad (2) $\dfrac{1}{2}$ \qquad (3) $-\dfrac{1}{2}$ \qquad (4) $-2$