Answer:
F x=1/2
Step-by-step explanation:
 
        
             
        
        
        
Answer:
y = 6
x = 0.2
Step-by-step explanation:
5x + y =7
20x + 2 = y
5x(4) + y(4) = 7(4)
20x + 4y = 28
(20x = 28 - 4y) = (20x = y - 2)
28 - 4y = y - 2
30 - 4y = y
30 = 5y
y = 6
5x + y =7
20x + 2 = y
y = 7 - 5x
7 - 5x = 20x + 2
5 - 5x = 20x
5 = 25x
x = 0.2
 
        
             
        
        
        
Answer:28
Step-by-step explanation:
Julio's number is x 
(X-13)*-3=-45
Divide by -3
X-13=15
Add13 to both sides
x=28
 
        
             
        
        
        
Jim is ranked third best in his class of 50 students.
        
             
        
        
        
Answer:
The fourth one I believe 
Step-by-step explanation: