Familiarize the coordinate and how it is look like. After you had familiarize, you will surely know about the y-axis, x-axis, quadrants, and points thingy. If the question will give you points, just plot the points.
For example, you are given the points (0, 4) and (5, 1)
Look at the 0, in the plane, once you have located 0, never go right and left to find 4, you will just have to find from above or below, since 4 is positive, then you can infer that it is above. Once again, go directly to 4 without going left and right because if you do, it will not be 0 anymore. So, go to 4, then put a point to the spot leveled by 0 horizontally, at the same time, leveled by 4 vertically. Now, you have already graphed it on the coordinate plane.
If it is a linear equation for example, say:
5x + y = 8
Assign a number of x, then solve for y.
What number will you want x to be? Say, that I want 1 for x, then, it becomes like this:
5x + y = 8
5(1) + y = 8
5 + y = 8
(use the properties of equality)
5 + y - 5 = 8 - 5
y = 3
Now, you have, points! Let us remember them, they were:
x = 1
and y = 3
So it becomes points (1, 3))
Note: 1 should come first before 3 because it is the value of x, and it is the abscissa if I am not mistaken.
Do the things above again to plot this, the graph of a linear equation will always be a straight line.