the coordinates are (view the graphic)
R(-4,7) S(-1,7)
U(-4,3) T(-1,3)
distance x=(-1-(-4))=3
distance y=(7-3)=4
B(1,-1) A(4,-1)
point C
Cx=Bx=1
Cy=By-4=-1-4=-5
point C(1,-5)
point D
Dx=Ax=4
Dy=Ay-4=-1-4=-5
point D(4,-5)
the answer is C(1,-5) and D(4,-5)
