write the coordinates of the vertices after a reflection over the $y$-axis.

write the coordinates of the vertices after a reflection over the $y$-axis.

write the coordinates of the vertices after a reflection over the $y$-axis.

Answer

Explanation:

Step1: Identify original coordinates

Original vertices: $B(8,1)$, $C(8,9)$, $D(5,4)$

Step2: Apply y-axis reflection rule

For a point $(x,y)$, reflection over y-axis is $(-x,y)$.

$B': (-8,1)$
$C': (-8,9)$
$D': (-5,4)$

Answer:

$B'(-8, 1)$, $C'(-8, 9)$, $D'(-5, 4)$