Y=19x+19b
To solve for b you first need to subtract 19x from both sides giving you:
y-19x=19b
Then, divide by 19 on both sides to get 
(y/19)-x=b
So b=(y/19)-x
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Answer:
7 1/2
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:3 by 1
Step-by-step explanation:
okay so I'll say the long side of a tile as x 
the short side of a tile as y
look at the short side of the big patio first, it's made up of 2 big and 2 small
so 2x+2y=8 or x+y=8 so two added together is 8. So one possibility is 3 and 1 because (3+1)2 = 9