constructing a simple line graph

Hey, well basically, i need to construct a simple line graph, with one thing on the y axis and another on the x and a line ofcourse.

i've got 3 pieces of data for each, i need to put 3 numbers into the y axis and 3 in the x and get a line from the 2 but i absolutely have no idea of doing this.

could you help, pleaaaaaseeee?

edit also, every time i type the 6 numbers i need excel makes 2 separate ones for each. its really annoying.