To truly understand how to graph this line, you need to begin at the basic foundation of a general equation. So, the standard form for a line is called slope intercept form, which mathematically equates to y = mx + b. M represents your slope (rise/run OR solved by formula) and B represents your y-intercept, which is determined with an equation or, if you have a graph, it's the point in which your line crosses the y-axis.
So, to graph your line, use what you know about the form. 2 is going to be your y-intercept and 1 will be your slope. You know that 1 is the slope because it's widely accepted that if a variable (x) is lacking a coefficient, it's just one. In other words, your line is y = 1x + 2.
Now you know where to start, place your pencil (or rather, digital pencil) on the coordinates (0, 2): the y-intercept. Then, since you know slope is 1, move up one unit and then to the right one unit. You do this because slope = rise/run, therefore, 1 = 1/1. You'll continue to move up one & right one until you reach the end of your graph. But wait, you aren't done yet. As you may have already discovered, the line if heading in a general direction at this point & it only takes up half of the graph. To draw the rest, go back to your original point (0, 2). Then, move down one & to the left one. This is because -1/-1 is also equal to 1, so the slope remains constant.
At this point, your line should be graphed completely & you should have a simple understanding on graphing equations. If you need further help, let me know.