There are really no more steps to be provided because the equation is already in a standard form

- there is nothing simplify there

The way you get a graph is by substituting two values for x and calculating y

for example if x = 0, y=6  (3*0+6)

if x = 1, y= 9 (3*1+6)

Then you draw these two points on the graph (0,6) and (1,9) and draw a line through them