= -2
y= 2x+6. y= -2x-2
 2x+6= -2x-2
+2x. +2x
____________
 4x+6= -2
 4x= -8
 x=-2
        
             
        
        
        
There would be 8 ones, 4 fives, 12 tens, and 4 twenties. That together would be about $228
        
             
        
        
        
1-
number 2) is correct 
2- 3) is true 
11) Jacob is not correct. because 6radical 5 is irrational 
12) radical 20 is an irrational number but
so a+b is irrational 
but 

so b+c is rational 
good luck