This is pretty simple once you get used to this
First set it equal to the original and the negative one
(>_) is the bigger and equal to part 
4x+5>_45 or 4x+5>_-45
Then solve for x for both 
4x>_40. 4x>_-50
X>_10 X>_-25/2
        
             
        
        
        
Y = mx + b
m = -2, b = 4
<span>y = -2x + 4</span>
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
Use the slope formula
(x2-x1)/(y2/y1)
substitute the values
(1-10)/(9-7)
solve
-9/-2
simplify
9/2 or 4.5
 
        
             
        
        
        
Answer:
C
Step-by-step explanation:
You are choosing 3 from a total of 12. Order does not matter. So you are working with combinations. The answer symbolically is
12C3
12C3 = 12!/(9!3!)
12C3 = 12 * 11 * 10 * 9!/(9! 3!)
12C3 = 12 * 11 * 10/6
12C3 = 2 * 11 * 10
12C3 = 220
 
        
                    
             
        
        
        
Your fraction answer would be I think 1/15