Can someone Please help me understand this?

Question

Which inequality is NOT part of the system of inequalities that defines a polygonal convex set that includes all points in the interior of a square whose vertices are: A(6,8), B(6, -8), C(-6, -8) and D(-6, 8)?

Answer 1

all interior points of the square

satisfy two inequalities, simultaneously

-6 < x < 6 and

-8 < y < 8

or 4 inequalities, if you break up the above

x>-6, x<6

y>-8, y<8