4. Join
Data Model  
Rectangle Triangle

Rectangle

x,y
x>=2,x<=7,y>=4,y<=10

 

Triangle

x,z
z<=-3x+21, z<=3x+3,z>=6

RO = join triangle and rectangle

x,y,z

z<=-3x+21, z<=3x+3,z>=6, x>=2,x<=7,y>=4,y<=10