Question

how would i explain this;

Answer 1

I see you totaled up the m/s for each graph, why not mention that? One went 2 m/s for 1s, then 1 m/s for 2s , that makes 4m. When you explain your reasoning, explain your actual reasoning, not just something you think they want you to say.

Answer 2

Area under the graphs gives the displacement. These are rectangles, so its length time breadth per rectangle. Each has two rectangles. 1 by 2 and 2 by 1 in top = 4, 1 by 1 and 1by 2 = 3 in bottom ...
They could also have done this with the dreaded triangles, or even more dreaded curves. Good old velocity time/speed time graphs ! Where would some of us be without them, and the accompanying (though not supplied) aspirins.
http://perendis.webs/com
Bon voyage