Quiz (1 point)
Given that:
    
    
a = b + c
    
    c = d
    
    Prove that:
a = b + d
The following properties may be helpful:
    - if a = b, then x + a = x + b 
- if the following are true: - a = b
- b = c
 - then a = c 
Please write your proof in the table below. Each row should contain one claim. The last claim is the statement that you are trying to prove.