Put in values for x and solve for y, or vise versa.
If x = 1, y = ...
If x = 2, y = ...
Plot these points and you will get your graph.
The graph of a linear equation is a line- and a line is determined by two points.
For this problem, the simplest thing to do is to choose x= 0, then solve the equation for y to get one point.
Now choose y= 0 and solve the equation for x to get the second point.
Plot those two points and draw the line through them.