Answer:
C 
Step-by-step explanation:
substitute -1 into all of the formulas, if both sides are equal, then it is correct, for C: 
2(x-2)+6 = 0, sub -1 
2(-1-2)+6=0, simplify and work out 
2(-3)+6=0 
-6+6=0 
0=0 
 
        
             
        
        
        
Answer:  
Step-by-step explanation:
 By definition, Direct proportion equations have the following form:
 
 Where "k" is the constant of proportionality.
 In this case you know that the distance (in meters) that an ant can travel varies directly with the amount of time (in hours) the ant spends walking.
 With this information you can write the following equation:
 
 According to the exercise, the constant of proportionality is:
 
 Therefore, substituting the value of the constant of proportionality into the equation, you get that  the equation that represents the proportional relationship between "d" and "t" is:
 
 
        
             
        
        
        
Answer:    B, C, and D
Step-by-step explanation:
Just did it and got the answers wrong so these are the correct ones
 
        
                    
             
        
        
        
Answer:
7
Step-by-step explanation:
7x + 68 = 2x + 103
Subtract 2x from each side
5x + 68 = 103
Subtract 68 from each side
5x = 35
divide 5 from 35 and you get X = 7 
 
        
             
        
        
        
x+y=10
x+2y=14
x is common in both so u have to subtract the second one from 1st 
x-x + y-2y = 10-14
-y = -4
y=4
which means bottle of water (y) = 4
and then substitute 4 in equation (x+y=10 or x+2y=10)
x + 4 = 10
x=6