A pencil or pen or other writing utensils. A ruler would also come in handy.
I looked up and I think you use them to draw graphs but can use them to draw straight lines.
keyboard
Use four to make a normal square and put two lines on top of another
Draw two lines that meet somewhere
Draw two horizontal straight lines that are slightly offset from each other. One above the other. Then, use a ruler or other straightedge to connect the outer ends of the lines.
you use lines and arrows and draw through numbers
I looked up and I think you use them to draw graphs but can use them to draw straight lines.
Ruler
Use A Ruler
keyboard
you draw straight lines with a ruler
Truthfully, grids help to draw straight lines, and beter accuracy.
use light shade and then draw lines with a pointed hard eraser or can use kneaded eraser.. hope this will help :)
Use four to make a normal square and put two lines on top of another
Draw two lines that meet somewhere
draw a half circle and alternate lines coming out of it with straight and wavy lines.
You cannot draw lines as such as it has no graphical facilities. You can use the underscore character to produce a horizontal line.