On a piece of paper ,graph y< -3/4x+2 and determine which graph matches the one on the paper

Firstly, draw the dashed line y=-3/4x+2 picking two points:

x=0, then y=2 and x=-4, then y=5 (line must be dashed, because the inequality is strict).
Secondly, decide which part you should take. For the point (0,0): 0<-3/4·0+2 is true inequality, then point (0,0) must belong to the shaded area.
From these steps you can conclude that the right choice is D.