Solving a Photo Display Budget Problem Using a System of Inequalities
Problem: Christy sells photographs at a street fair booth. She wants at least 25 photos on display. Each small photo costs her $4 and each large photo costs $10, and she cannot spend more than $200 on display photos.
ⓐ Set up the system. Let = the number of small photos and = the number of large photos. Translating the two constraints:
- "At least 25 photos" →
- "No more than $200" →
The system is:
ⓑ Graph the system. Graph as a solid boundary line. Testing : is false, so shade the side away from the origin. Graph as a solid boundary line. Testing : is true, so shade the side containing the origin. The solution is the doubly-shaded overlap region.
ⓒ The point does not lie in the solution region, so displaying 10 small and 20 large photos would not meet both constraints.
ⓓ The point does lie in the solution region, so displaying 20 small and 10 large photos satisfies both constraints.
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