Okay, for this one I would use elimination:
8x+(-2y)-10
 or
8x-2y=10
2x=4y
x=2y
8(2y)-2y=10
16y-2y=10
14y=10
y=5/7
x=10/7 or 1 3/7. Hope it help!
        
             
        
        
        
Greeting to you! My name is Cecille and I’m here to answer that question
For more explanation, please see the attachment
 
        
        
        
Answer:
B
Step-by-step explanation:
Multiply x/20 each side
 
        
                    
             
        
        
        
I had that question yesterday
 
        
             
        
        
        
In the given question, it is already mentioned that Pam takes 15 minutes to type 2.5 pages. this information should be used as the main information for reaching the desired answer. 
Pam typed 2.5 pages in = 15 minutes
Then time taken by Pam to type 23 pages = (15/2.5) * 23
                                                                     = 345/2.5
                                                                     = 3450/25
                                                                    = 138
So Pam will take 138 minutes to type 23 pages