Tracy tells Huey that he can improve his economics grade without sacrificing fun activities or his grades in other courses. Can you imagine ways in which this might be possible? What does that imply about the initial situation? If Huey is taking just two courses and he can improve his economics grade without hurting his math grade, how could you represent this situation graphically?
Tracey is telling Huey he is not using his time efficiently. Perhaps he is studying economics in his dorm room while his roommate is always watching television and playing music loudly. By moving to a more conducive study environment such as the library, Huey could get more out of his study time.
Alternately, it’s possible Huey has been doing other activities that are neither work for other courses nor fun, and that he could improve his economics grade by reducing time spent in one or more of those activities.
The following graph shows Huey improving his economics course without hurting his math grade:
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