So first, you need to identify the parts of this equation.
3x is the slope of the line, which is [tex]\frac{3}{1}[/tex].
-5 is the y-intercept. or the part of the line that touches the y-axis.
The first thing you want to do is plot the y-intercept. SO, go to the y-axis and find -5. Plot your point there.
Now, use the slope [tex]\frac{3}{1}[/tex] to find your next plot. Since slope is [tex]\frac{rise}{run}[/tex], you go up three, and over to the right one.
Now, draw a line connecting the dots. Your slope should be positive and look like > /
~theLocoCoco