Given equation :

To graph the equation we need coordinates values of (x,y) so let us put different values of x to determine the corresponding value of y.
put x=0

Thus, (x,y)= (0,6).
put x=1

Thus, (x,y)= (1,5.75)
put x=2

Thus, (x,y)=(2,5.5)
Put x=3.

Thus, (x,y)= (3,5.25)
contiuning like this we get a graph as below,