Triangles DEF and D'E'F' are shown on the coordinate plane below: D
E
F
2 3 4 5 6 7 8
-8-7-6-5-4-3-2-1
F
E2
D'
What rotation was applied to triangle DEF to create triangle D'E'F'?
90° clockwise
180°
None of the above
90° counterclockwise

180° rotation

Step-by-step explanation:

(x , y) --> (-x , -y)

The D' coordinate has mistake on the graph, it should be (-1 , -7) instead of (-1 , -6)

the slope of the first function is -3. (3/1)

the slope of the second function is 1. (13-10/6-3).

since |-3| is greater than |1|, the function with the steepest slope is the first.