Melissa scored w points in each game. She also got x bonus points in each game. How many points did she score in y games?
In one game, Melissa would score w + x points. 
In two games, Melissa would score 2(w + x) points. 
In three games, Melissa would score 3(w + x) points. 

In general, in y games, Melissa would score y(w + x) points.