Answer:
that will be 768!!!
Step-by-step explanation:
 
        
             
        
        
        
The equation that models this situation is z = 7.9y + 12.
A linear equation is a function that has a single variable raised to the power of 1.  An example is x = 4y + 2.
Where: 
- 2 is the constant
- x = dependent variable 
- y = independent variable  
From the equation given, 12 would be the constant, the independent variable would be 7.9 and z would be the dependent variable. 
z = 7.9y + 12 
Here is the complete question: A barrel of oil was filled at a constant rate of 7.9 gal/min. The barrel had 12 gallons before filling began. write an equation in standard form to model the linear situation.
A similar question was answered here: brainly.com/question/2238405
 
        
             
        
        
        
Answer:
2. is not an equation
Step-by-step explanation:
An equation always has an equal sign. An expression doesn't