Question

Triangle A has points/coordinates of C(-2, 4), D(-3, 2), E(-1, 1). List the coordinates of the new image after Triangle A is reflected across the Y-axis.

Answer 1

The coordinate points of the triangle are:

$\begin{gathered} C\mleft(-2,4\mright) \\ D\mleft(-3,2\mright) \\ E\mleft(-1,1\mright) \end{gathered}$

The graph of this original points is as follows:

Now, to make the reflection across the Y-axis, we follow this rule of transformation:

$(x,y)\longrightarrow(-x,y)$

so the points become the following:

$\begin{gathered} C^{\prime}(2,4) \\ D^{\prime}(3,2) \\ E^{\prime}(1,1) \end{gathered}$

Which, if we graph them, we get :

Answer:

$\begin{gathered} C^{\prime}(2,4) \\ D^{\prime}(3,2) \\ E^{\prime}(1,1) \end{gathered}$