The system of inequalities can model Gabrielle’s situation is; 
x + 2y ≤ 20
x + 2y ≤ 203x + 2y ≤ 21
<h3>Inequality</h3>
It follows from the task content, that the inequalities which can be used to model Gabrielle's situation be determined.
By setting variables as follows;
- batches of brownies = x 
 - batches of cookies = y
 
Brownie:
Sugar = 1 cup
Eggs = 2
Cookie:
Sugar = 3 cups
Eggs = 2
x + 2y ≤ 20
x + 2y ≤ 203x + 2y ≤ 21
Learn more about inequality:
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Out of 3 coins, if you are given that 1 is on tails, then the most heads you could have is 3 coins - 1 tails = 2 heads.
The probability of getting 3 heads would be 0.
        
             
        
        
        
7*y - 5*(4-2y) = 7y - 20 +10y = 17y-20 = 31, 
y =3, x = -2.
Weird 20 min without answer!
        
                    
             
        
        
        
Answer:
x = 32/3 
Step-by-step explanation:
p(x) = 13 
x + 7/3 = 13
x = 13 - 7/3
x = 32/3