Answer:
The cost of hardbook is $9 and cost of paperback is $5.
Step-by-step explanation:
Let x be the price for hardback book and y be the price for paperback book.
Mr. Yamamoto purchased 42 new hardcover books and 64 new paperback books, which cost a total of $698.
We can write the equation as:

He also purchased 42 new hardcover books and 58 new paperback books, which cost a total of $668.
We can write the equation as:

We have to use the elimination method to solve the two equations.
We eliminate x by subtracting the two equations.

Thus, the cost of hardbook is $9 and cost of paperback is $5.
 
        
             
        
        
        
Answer:
have a good one
Step-by-step explanation:
 
        
             
        
        
        
Your subtracting 3x from 5x: 5x-3x
This is so you only have a variable on one side
        
                    
             
        
        
        
If you take 25% off of 16 you would pay $12(75% left to pay).
        
             
        
        
        
Answer:
(x, y) --> (x + 4, y - 3)
Step-by-step explanation:
The x value concerns left and right, while the y value concerns up and down. Adding to x makes it move right, and adding to y makes it move up.