Question

first, reflect triangle def using the y - axis as the line of reflection. start by reflecting the vertices of the triangle, points d, e, and f.
original point
d (3, - 3)
e (5, - 8)
f (3, - 8)

Explanation:

Step1: Recall reflection rule

When reflecting a point $(x,y)$ over the y - axis, the rule is $(-x,y)$.

Step2: Reflect point D

For point $D(3,-3)$, applying the rule gives $D'(-3,-3)$.

Step3: Reflect point E

For point $E(5,-8)$, applying the rule gives $E'(-5,-8)$.

Step4: Reflect point F

For point $F(3,-8)$, applying the rule gives $F'(-3,-8)$.

Answer:

The new points are $D'(-3,-3)$, $E'(-5,-8)$, $F'(-3,-8)$