Question 97531
MAKE UP A TABLE WITH COLUMS LABELED X & Y.
SET X=0 & SOLVE FOR Y THUS:
0+Y=Y
Y=4 SO ENTER 0,4 IN THE TABLE.
SET X=1 
1+Y=4
Y=4-1
Y=3 SO ENTER 1,3 IN THE TABLE
SET X=5
5+Y=4
Y=4-5
Y=-1 SO ENTER 5,-1 IN THE TABLE.