Question 1.).
Column A.):  
Answer ==>  z  =  61  –   18, is Related to  z  +  18   =  61,   ==>   z    =   43
Answer: ===>  18   =    61    -  z,  is Related to  z    +   18   =  61,   ===>   z   =   43
z      +     18     =   61
Let's solve your equation step-by-step.
z     +     18      =     61
Step 1: Subtract 18 from both sides.
z  +   18   −   18    =     61    −     18
z     =     43
Graph:  ========>   z    +    18     =     61  =========>     z     =======>    43
Column (A),    
Answer:     =======>    
z     =      43
Question 2.).   
Column. B.):  
Answer: =====>   61 + 18   =   z,  Related to z  - 18  =  61  ====>  z   =   79 Answer: ===>   –18   =   61   –   z,  Related to   z  -   18   =  61  ====>  z  =  79     
z      -     18     =     61
Let's solve your equation step-by-step.
z         −       18        =           61
Step 1: Add 18 to both sides.
z     −     18     +     18     =     61       +        18
z    =       79
    Answer    
z     =      79
Therefore, The answers to your Equation: Column (A),/Column (B)
Question 1.).
Column A.):  
Answer ==>  z  =  61  –   18, is Related to  z  +  18   =  61,   ==>   z    =   43
Answer: ===>  18   =    61    -  z,  is Related to  z    +   18   =  61,   ===>   z   =   43
Question 2.).   
Column. B.):  
Answer: =====>   61 + 18   =   z,  Related to z  - 18  =  61  ====>  z   =   79 Answer: ===>   –18   =   61   –   z,  Related to   z  -   18   =  61  ====>  z  =  79   
Hope that helps!!!!!!!!                            : )