393,480 views
34 votes
34 votes
Need help on number 5 please.

Need help on number 5 please.-example-1
User Bassam Qarib
by
2.9k points

1 Answer

25 votes
25 votes

9514 1404 393

Answer:

(x, y) ⇒ (y, -x)

Explanation:

Rotation 90° CW is described by the transformation ...

(x, y) ⇒ (y, -x)

_____

Additional comment

If you consider a point on the x-axis after a 90° CW rotation, you realize it must have been on the y-axis before the rotation. That is, the new x-value is the old y-value.

Similarly, a point on the y-axis after rotation 90° CW must have been on the -x axis before the rotation. The new y-value is the old -x value:

(x, y) ⇒ (y, -x) . . . . . (old coordinates) ⇒ (new coordinates), 90° CW

User Manas Sambare
by
2.7k points