Which glide reflection describes the mapping △ABC → △DEF?

A. (x, y) → (x, y – 6) and reflected across x = 0
B. (x, y) → (x – 2, y) and reflected across x = -1
C. (x, y) → (x, y – 6) and reflected across y = 0
D. (x, y) → (x, y – 6) and reflected across x = -1

IMAGE: https://vie1160-912-pps.gradpoint.com/Resource/8766464,0/Assets/testitemimages/geometry_b/transformations/mc116-1.jpg

Question

Which glide reflection describes the mapping △ABC → △DEF? 
 	
	A. (x, y) → (x, y – 6) and reflected across x = 0
	B. (x, y) → (x – 2, y) and reflected across x = -1
	C. (x, y) → (x, y – 6) and reflected across y = 0
	D. (x, y) → (x, y – 6) and reflected across x = -1

IMAGE: https://vie1160-912-pps.gradpoint.com/Resource/8766464,0/Assets/testitemimages/geometry_b/transformations/mc116-1.jpg

danjs · Answer

you want to line up corresponding points,  A to D,   B to E  and C to F

since the right sides are parallel to each other BC and EF

you can translate them to line up vertically first
then
put a vertical reflection line right in the middle of the two 

try it out