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The equation for Louis's purchase is: 
The equation for Kate's purchase is: 
The equation for Biff's purchase is: 
Step-by-step explanation:
First of all we have to define variables for each item involved in the purchase
Let x represent burger
y represent soda
z be the slice of pizza
Then
"Louis bought a burger and soda for $8"

"Kate purchased a slice of pizza and soda for $9"

"Biff purchased a burger, a slice of pizza and a soda for $13.50"

The equation for Louis's purchase is: 
The equation for Kate's purchase is: 
The equation for Biff's purchase is: 
Keywords: Linear Equations, Variables
Learn more about Linear equations at:
#LearnwithBrainly
ANSWER:
◻ Rational no. —: Addition & Multiplication (Yes) and Subtraction & Division (No)
◻ Integers —: Addition & Multiplication (Yes) and Subtraction & Division (No)
◻ Whole no. —: Addition & Multiplication (Yes) and Subtraction & Division (No)
◻ Natural no. —: Addition & Multiplication (Yes) and Subtraction & Division (No)
To expand you must first distribute (multiply) the 2 to the numbers inside the parentheses
2(x - 5)
(2 * x) + (2 * (-5) )
2x + (-10)
2x - 10
There are no like terms, therefore (x - 5)2 expanded is 2x - 10
Hope this helped!
~ Just a girl in love with Shawn Mendes
The answer is D i’m pretty sure but i’d get that checked out again