Answer:
15
Step-by-step explanation:
first you have to subtract 4 from 19 to get what k is. that should be your answer. good luck!
 
        
             
        
        
        
Hello! We know that we have $400. So 23 ten dollar bills is equal to $230. How? We multiply 23 x 10 and get $230. Then, we have 46 dimes. A dime is worth 10 cents so we multiply 46 x 10 which equals $4.60. And of course we have the 19 cents. Now we add. 400 + 230 + 4.60 + 19 = $653.6. 
Hope this Helps!
 
        
             
        
        
        
It is in standard form: y=mx+b
        
             
        
        
        
I took geometry a while ago, I can help if you want.