Question

ABCD is a quadrilateral that forms A'B'C'D' when it is reflected along the y-axis. Which of the following points in the graph are wrongly marked?

• A. Only A'
• B. Only D'
• C. Both A' and D'
• D. Both B' and C'

Answer 1

The correct option is C Both A' and D'

Rule for reflection along y-axis:
$(-x,y\to x,y)$

On reflecting the coordinates of quadrilateral ABCD across the y-axis, we get:

A(-6,4) = A'(6,4)

B(-2,8) = B'(2,8)

C(-2,2) = C'(2,2)

D(-6,0) = D'(6,0)

Plotting the points on the graph, we observe:


So the wrongly marked coordinates are A' and D'.