Label your graph the horizontal line is “X” and the vertical line is Y”. the origin is always (0.0) which is where the two lines meat dead center of the graph. From the origin go to the left counting in negatives... 0,-1,-2,-3.... etc. do the same thing going towards the right but in positives, then go up from the origin counting in positives and then down from the origin in negatives like you did going left. OKAY now if a coordinate is (-3,6), -3 is your “X” and 6 is your “Y” so you would go left negative 3 on the X line (horizontal line) and once you get to negative 3 you go UP 6. There is your first coordinate plotted on your graph
