Part 1) we have


Step 

Graph the system
using a graph tool
The solution of the system of inequalities is the shaded area
see the attached figure N 

we know that the point that represents a solution to the system are inside the shaded area
Step 

Graph the points
we have
 
 
the point that represents a solution to the system are
the solution is the point B------> see the attached figure N 

Part 2) we have


Step 

Graph the system
using a graph tool
The solution of the system of inequalities is the shaded area
see the attached figure N 

we know that the point that represents a solution to the system are inside the shaded area
Step 

Graph the points
we have

the point that represents a solution to the system are
the solution is the point D------> see the attached figure N 

Part 3) we have


Step 

Graph the system
using a graph tool
The solution of the system of inequalities is the shaded area
see the attached figure N 

we know that the point that represents a solution to the system are inside the shaded area
Step 

Graph the points
we have

the point that represents a solution to the system are
the solution is the point B------> see the attached figure N 
