Solve y = x + 8 for x
Ox=y + 8
Ox=y-8
Ox= -y + 8
Ox= -y - 8

The correct match are as follows:

1. plane.
b) a flat surface that extends infinitely and  has no depth; it has length and width
2. perpendicular lines.
d) two lines that intersect at 90˚ angles. 

3. parallel lines.
a) two lines that lie within the same plane and never intersect. 

4. circle.
c) a set of all points in a plane that are a given distance from a point.

5. angle
e) a figure consisting of two rays with a common endpoint.