The figure shows ΔDEF and ΔD'E'F'. Fill in each entry box with the answer. The glide reflection that maps ΔDEF onto ΔD'E'F' is T º Ry = 1 where a = ____ and b = ____
Does the order of translations and reflection matter in the glide reflection? Answer yes or no.

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Step-by-step explanation:

Reflecting D over y=1 moves it to D'(-2, 4). An additional translation of (-2, 0) is required to move it to D'(-4, 4).

The translation only affects the x-coordinate, so can occur either before or after the reflection, which only affects the y-coordinate.

The order of transformations does not matter.

3

Step-by-step explanation:

- 3 + 5 - (-1)

We are subtracting a negative so it becomes a positive.

- 3 + 5 + 1

-3 + 6 = 3