Question

rotations
find $a$ after $r_{90^{\circ}}(x,y)=(-y,x)$.
$a = (?, \quad)$

Explanation:

Step1: Identify coordinates of A

From the grid, point A is at $(2, 8)$.

Step2: Apply rotation formula

Use $r_{90^\circ}(x,y)=(-y,x)$. Substitute $x=2$, $y=8$:
$A' = (-8, 2)$

Answer:

$A' = (-8, 2)$