Sara is serving wings and burgers at her party. wings cost $6.00 per serving and burgers are $3.00 each. sara knows that at least 4 of her friends want wings. sara must spend less than $45.00. sara graphs a system of inequalities to determine how many servings of each kind of food she could serve to stay within her budget.

according to the dark blue area on the graph, how many burgers could sara serve if she serves wings to 7 guests?