Identify the x and y coordinates; they will be placed along the x and y axis. The x axis is horizontal whilst the y axis is vertical. You will be given an ordered pair (0,0) with the first number being the x coordinate and the second y. You will locate the x axis and plot the x coordinate according to negative or positive (left or right). You will move two spaces to the left of the origin if you have negative two, and two to the right of it if it were positive. From there identify the y coordinate. If it is negative you will move that amount downwards from the x coordinate. If it's positive you move upwards.
So if you had (2, 7)
Locate the origin. Move two spaces to the right along the x axis. Move 7 spaces upwards from the previous point, and plot a dot.