Algebra Word Problem, please help?

A restaurant prepares tuna fruit salads and chicken caeser salads for lunch parties. The number of people who request tuna fruit never exceeds 2/3 of the number who order chicken caeser salads. The smallest group that the restaurant nooks for lunch is 50. Write a system of inequalities that describes the number of salads to be made. Graph the solution set using shading. Label the vertices.

If someone can show me how to do this and at least explain to me how to graph, it'd be greatly appreciated. THANKS!