For point A we can see that x is 2 and one fourth that is 2 1/4 and y is 1 and a half that is 1 1/2 therefore
A(2 1/4 , 1 1/2)
For point B we can see that x is -1 and one fourth that is -1 1/4 and y is 1 and a half that is 1 1/2 therefore
B(-1 1/4 , 1 1/2)
For point C we can see that x is -2 and one half that is -2 1/2 and y is one fourth that is 1/4 therefore
C(-2 1/2 , 1/4)