Since jason is currently at 54 feet above sea level and David is 11 feet below sea level the add 11 plus 54 which would give you 65 feet is there distance of elevations
        
             
        
        
        
46
When it says f(4) that means x=4
So you then just fill in all the x’s with 4’s and solve as normal
        
             
        
        
        
Answer:
addition prop of equality 
Step-by-step explanation:
youre welcome 
 
        
             
        
        
        
Answer:
The correct answer is D) (-2, -1)
Step-by-step explanation:
In order to solve this system of equations, start by multiplying the entire first equation by 2. Then add the two equations together. This will get the y's to cancel and allow you to solve for x. 
-4x + 2y = -10
3x - 2y = 12
---------------------
-x = 2
x = -2
Now that we have the value for x, we can find y by plugging the x value into either equation. 
-2x + y = -5
-2(2) + y = -5
-4 + y = -5
y = -1