Please help! (I'll give brainliest to the first right answer.) (you don't have to do 2 and 4)
Nobody has gotten it right so far :(

1. initial point is (2, 4)

reflected point is (-2, 4)

the coordinates are similar because they involve the same numbers, however, with the reflection across the Y axis, the X point became negative.

2. initial point is (2, 4)

reflected point is (2, -4)

again, same numbers but the X value becomes negative

Hope this helps!