Question

A sequence of transformations maps ∆ABC to ∆A′B′C′. The sequence of transformations that maps ∆ABC to ∆A′B′C′ is a reflection across the ( 1. y-axis 2. x-axis 3. line y=x 4.

line y=-x) followed by a translation (1. 4 units to the right and 10 units up 2. 8 units to the right and 4 units up 3. 10 units to the right and 2 units up 3. 10 units to the right and 4 units up)

Answer 1

Below

Explanation:

Got it correct

Answer 2

• 3. line y=x
• 4. 10 units to the right and 4 units up

Explanation:

In the attached diagram, the green polygon A"B"C" is the reflection of ABC across the line y=x. Then the purple polygon A'B'C' is the translation of A"B"C" 10 units to the right and 4 units up.

_____

You can tell a reflection is involved, because the clockwise order of A, B, C in the original is reversed to counterclockwise in A'B'C'. The left-right horizontal line AC becomes the down-up vertical line A'C', so you know the reflection is across the line y=x, and not the line y=-x.

After the reflection, point A" is located at (2, -6), so moving it to A'(12, -2) entails a translation 10 units right and 4 units up.