Answer:
See Explanation
Step-by-step explanation:
Given

Solving (a): Reflection over x-axis
The reflection over the x-axis is: (x , -y)
So:
Point
becomes

Line of symmetry: x-axis
Solving (b): Reflection over y-axis
The reflection over the y-axis is: (-x , y)
So:
Point
becomes

Line of symmetry: y-axis