Answer:
4 + 13y
Step-by-step explanation:
 
        
                    
             
        
        
        
To find the slope take your points, they should be (x1,y1) (x2,y2), proceed to subtract y2-y1 over x2-x1. after you calculate that simplify and put it in y=mx+B (the slope goes in the m position and x is usually left open)
        
             
        
        
        
Answer:
A=z
B=-2
C=0
D=30
Step-by-step explanation:
First lets simply the equation 
21 - (2x +3)2 + 4(1-1) + z^3
21 - (2x^2 + 9) + 4(0) + z ^3
21 - 2x^2 + 9 + z^3
 - 2x^2 + z ^3 + 30
This means that:
A=z
B=-2
C=0
D=30
 
        
             
        
        
        
(1,52)(-1,-52) (2,26)(-2,-26)(4,13)(-4,-13)(1/2,104), etc etc etc