To find the cost of each shirt and hat using graph.
The cost of each shirt is $25 and the cost of each hat is $20.
Given information:
One friend bought 2 shirts and 1 hat for $70 and other friend bought 1 shirt and 3 hats for $85.
Calculation:
Let the cost of each shirt and hat be
Set up the cost equations for both the persons.
  
Graph the two equations on the same coordinate plane.
  
Observe that the two lines intersect at the point
Therefore, the cost of each shirt is $25 and the cost of each hat is $20.
Conclusion:
The cost of each shirt is $25 and the cost of each hat is $20.
Chapter 6 Solutions
High School Math 2015 Common Core Algebra 2 Student Edition Grades 10/11
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