Question

question 10
6 pts
triangle efg has vertices e(-3, 1), f(1, 1), and g(4, 5). find the coordinates of the image of point f after a reflection across the y - axis.
(-1, 1)
(-1, -1)
(1, -1)
none of the other answers are correct
(1, 1)

Explanation:

Step1: Recall reflection rule

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

Step2: Apply rule to point F

The coordinates of point $F$ are $(1,1)$. Using the rule, when $x = 1$ and $y=1$, the new $x$-coordinate is $-1$ and the $y$-coordinate remains $1$. So the image of point $F$ is $(-1,1)$.

Answer:

A. $(-1,1)$