The y intercept tells us that the point (0,-2) is on the line.
Move 3 units up and 2 units to the right to arrive at (2,1) as another point on this line.
The pattern "up 3, right 2" is from the slope.
Plot the two points (0,-2) and (2,1)
Draw a straight line through them.
GeoGebra and Desmos are two graphing tools I recommend.