Someone please help, I really don't understand!!

A triangular pyramid begins with its vertices locate at the following points:
P(-1,2,0), Y(2,3,0), R(-3,4,0), and A (−2,1,5) . The pyramid is then reflected over the yz-plane. The reflected
image is then translated using the rule: (x, y, z) --> (x + 2, y + 4, z – 3).

(a) Use the general rule for the reflection over the yz-plane: (x, y, z) -->(-x, y, z).
(b) Show the new points (x, y, z) after the reflection.
(c) Start with the reflection points from (b) and then apply the translation using the rule above.
(d) Show the final points (x, y, z) after the translation.