Question

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

Explanation:

Step1: Identify coordinates of D

From the grid, point D is at $(6,1)$.

Step2: Apply 90° rotation formula

Use $r_{90^\circ}(x,y)=(-y,x)$. Substitute $x=6$, $y=1$:
$(-1,6)$

Answer:

$D' = (-1, 6)$