The easiest way is to plot the intercepts then draw a line through the points to join the intercepts.
To find the x intercept put y=0 and solve for x: 3x=4, x=4/3=1⅓ or about 1.33, so mark this point on the x axis.
To find the y intercept put x=0 and solve for y: 2y=4, y=2, so mark this point on the y axis.
Now draw a straight line to pass through the two points.