We know the length is 2 more than the width so 12+2 is. equal to 14. So the length is 14. Perimeter equals Length plus Length plus width plus width so...L+L+W+W=Perimeter. 14+14+12+12=52.
You just literally mark the graph, you see the 1st points (2,12) go on the X axis to 2, then go up to 12 and mark that as a point. and continue with this tactic with the rest.