The line graph was invented by Rene Descartes. Descartes is noted for being proficient in French philosophy, mathematics and physics. I'm not sure if Rene was a male or female though
http://www.ask.com/question/whoinventedtheline...

A Swiss mathematician, Leonhard Euler, is who came up with graphs. He was born in 1707 and died in 1783. He discovered graphs while working on Kaliningrad bridge in Russia.
http://answers.ask.com/Science/Mathematics/who_inv...

1. Draw a line along the left side of your graph paper, leaving at least an inch or two of room to the left. This is your Y axis. 2. Write numbers along the left side of your Y axis
http://www.ehow.com/how_6234082_createlinegraph....

1 Graph a regular line. Ad 2 Shift it along the yaxis. 3 Move the points on the first line equal distance up or down. Do not shift the points left or right. Ad
http://www.wikihow.com/GraphParallelLines
