When a point is reflected, it must be reflected across a line.
The coordinates of the reflected points are: [tex]A' = (-1,1)[/tex], [tex]B' = (-1,3)[/tex] and [tex]C' = (2,4)[/tex]
The coordinates of the triangle are given as:
[tex]A = (1,1)[/tex]
[tex]B = (1,3)[/tex]
[tex]C=(-2,4)[/tex]
The dashed line is the y-axis;
The rule of reflection across the y-axis is:
[tex](x,y) \to (-x,y)[/tex]
So, the coordinates of the reflected points are:
[tex]A' = (-1,1)[/tex]
[tex]B' = (-1,3)[/tex]
[tex]C' = (2,4)[/tex]
Hence, the coordinates of the reflected points are: [tex]A' = (-1,1)[/tex], [tex]B' = (-1,3)[/tex] and [tex]C' = (2,4)[/tex]
Read more about reflection at:
https://brainly.com/question/4289712