Question

Use the figure and coordinate plane at the right forExercises 1-3.2. Graph the image of ADEF under a reflection across the line y = -1. Label the image D"E"F".

Answer 1

Given

The triangle DEF.

To graph the triangle DEF under a reflection across the line y=-1.

Now,

It is given that, the triangle DEF.

The graph of the triangle DEF under the reflection across the line y=-1 is,

Here, the vertices of DEF is (1,1), (3,3), (6,1).

Then, for y=-1, the vertices of D"E"F" is,

$\begin{gathered} (1,-1-2)\rightarrow(1,-3) \\ (3,-3-2)\rightarrow(3,-5) \\ (6,-1-2)\rightarrow(6,-3) \end{gathered}$

Hence, the coordiantes of D"E"F" are (1,-3), (3,-5), (6,-3).