How to reflect the object over the y axis

Answer:
Step-by-step explanation:
The transformation required is a reflection across y-axis.
According to the rules of transformations, to reflect a figure, we have to multiply a variable by "-".
If we want to reflect across the x-axis, we have to change each y-value to its opposite.
If we want to reflect across the y-axis, we have to change each x-value to its opposite.
So, in this case, by multiplying each x-coordinate by "-", we'll obtain the reflection.
From the graph, we see that coordinates of the figure are
X(-1,3)
Y(2,1)
Z(-3,-3)
So, the coordinates of the reflected figure are
X'(1,3)
Y'(-2,1)
Z'(3,-3)