Answer:
D
Step-by-step explanation:
The equations are
● 4x + 2y = 10 (1)
● 4x - 2y = -10 (2)
● 4x + 2y = 10 
Add - 4x to both sides 
● 4x + 2y -4x = 10 -4x 
● 2y = 10 -4x 
Divide both sides by 2 
● 2y/2 = (10 - 4x)/2 
● y = 5 - 2x 
● y = -2x + 5 (1) 
● 4x - 2y = -10
Add -4x to both sides 
● 4x -2y -4x = -10 - 4x
● -2y = -10 - 4x 
Divide both sides by -2 
● -2y/-2 = (-10 -4x)/-2
● y = 10 + 2x 
● y = 2x + 5 (2) 
So the equation are 
● y = 2x + 5 
● y = -2x + 5 
Graph them 
The lines intersect at (0,5) but aren't perpendicular
So the answer is d
 
        
             
        
        
        
C= 2000 + 3(2500)
C= 2000 + 7,500
C= $9,500
        
             
        
        
        
Answer:
18
Step-by-step explanation:
Factors of 54
1, 2, 3, 6, 9, 18, 27
Factors of 72
1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36
Factors of 18
1, 2, 3, 6, 9, 18.
Greatest Common Factor
We found the factors and prime factorization of 72, 54 and 18. The biggest common factor number is the GCF number.
So the greatest common factor 72, 54 and 18 is 18.
 
        
                    
             
        
        
        
Answer:
Can you maybe elaborate the question with the help of brackets I guess ...?
It is difficult to understand the question this way .