Answer:
it is an arithmetic sequence
m is slope
b is y-intercept
Step-by-step explanation:
 
        
                    
             
        
        
        
You can start by subtracting different equations from each other.
3x + 2y + 3z = 1
subtract
3x + 2y + z = 7
2z = -6 
divide by 2
z = -3
add the following two expressions together:
3x + 2y + z = 7
3x + 2y + 3z =1
6x + 4y + 4z = 8
subtract the following two expressions:
6x + 4y + 4z = 8
5x + 5y + 4z = 3
x - y = 5
^multiply the whole equation above by 3
3x - 3y = 15
subtract the following two expressions: 
3x - 3y = 15
3x + 2y = 10
-5y = 5
divide each side by -5
y=-1
take the following expression from earlier:
x - y = 5
substitute y value into above equation
x - - 1 = 5
2 negatives make a positive
x + 1 = 5
subtract 1 from each side
x = 4
Therefore x = 4, y = -1, z = -3
I checked these with all 3 equations and they worked :)
(it's quite complicated, comment if you don't understand anything) :)
 
        
             
        
        
        
Y= $0.59(x)
y= $0.59(12) 
y=? 
y is the total
x is the amount of pen 
so you multiply the cost of each pen with the amount of pens 
$0.59 times 12
        
                    
             
        
        
        
Answer:
28
Step-by-step explanation:
16 Ada to eves house 
12 Eva to pool
28 
 
        
                    
             
        
        
        
It says that there was an error with my answer, but I don't know what, so I screenshotted what I typed and attached them as 4 images below: