The very dark region is the solution to the possible combinations of ticket sales
Let x represent the number of adult tickets and y represent the number of student tickets.
Each member of the team must make a minimum of $300. Hence:
60x + 20y ≥ 300 (1)
The cannot sell more than 10 tickets. Hence:
x + y ≤ 10 (2)
Plotting equations 1 and 2 using geogebra online tool. The very dark region is the solution to the possible combinations of ticket sales.
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