Question

4. A triangle has vertices (–2, –3), (3, 5), and (8, –1).

a. Write a matrix expression to represent reflecting the triangle across the x-axis. Evaluate the matrix expression and list the coordinates of the vertices of the transformed figure.

Answer 1

|+1 +0 | |-2 +3 +8 |
|+0 -1 | |-3 +5 -1 |
=
| -2 +3 +8 |
| +3 -5 +1 |
so
(-2,3), (3,-5), (8,1)