could you please help me work this problems out? please!

FIRST PROBLEM

The equation:

|x/2| + |y/2| = 5

encloses a certain region on a coordinate plane. What is the area of this region?

SECOND PROBLEM

How many different numbers are there such that ax + b = c (a,b,and c are constants) ?

1. c>b

2. a>1

A. Statement 1. is sufficient

B. Statement 2. is sufficient

C. Statements 1. and 2. together are sufficient

D. Each statement alone is sufficient

E. Both statements together are not sufficient

thank you