Question

question 1-1
triangle jkl has the coordinates j(9,3) k(5,4) l(8,-4).
the triangle is reflected across the y - axis.
what are the vertices of triangle jkl?
j(
)
k(
)
l(
)

Explanation:

Step1: Recall reflection rule

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

Step2: Find $J'$

For $J(9,3)$, applying the rule: $x = 9,y = 3$, so $J'(-9,3)$.

Step3: Find $K'$

For $K(5,4)$, with $x = 5,y = 4$, we get $K'(-5,4)$.

Step4: Find $L'$

For $L(8,-4)$, since $x = 8,y=-4$, then $L'(-8,-4)$.

Answer:

$J'(-9,3)$
$K'(-5,4)$
$L'(-8,-4)$