Concept explainers
To determine all the combination of T-shirt and dress shirt one can buy.

Explanation of Solution
Given:
$100 gift certificate
T-shirts for $15 and dress shirts for $22
Spend no more than the amount of the gift certificate
Want to leave at most $10 of the gift certificate unspent
Need at least one dress shirt
Calculation for graph:
Let
Each T-shirt cost $15 so cost of T-shirts is $
Each dress shirts cost $22 so cost of dress shirts is $
Total cost is
Want to spend no more than $100,
So,
So, the boundary line expression is,
Substituting
Values of y | Value of x |
6.7 | 0 |
Substituting
Values of x | Value of y |
4.5 | 0 |
Now plotting the graph,
Graph I:
Solving the inequality for
Since, the expression is having
Graph II:
Want to leave at most $10 of the gift certificate unspent which means
Therefore, expression is,
So, the boundary line expression is,
Substituting
Values of y | Value of x |
6 | 0 |
Substituting
Values of x | Value of y |
4.1 | 0 |
Now plotting the graph,
Graph III:
Solving the inequality for
Since, the expression is having
Need at least one dress shirt that is,
The boundary line of this inequality is
So the final graphical solution of the inequality is,
Graph IV:
So, the deep purple area with black border represents the all possible combination of T-shirt and dress shirt one can buy.
Interpretation:
Therefore, deep purple area with black border represents the all possible combination of T-shirt and dress shirt one can buy.
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