Answer:
If x+1/x= 3 Then the answer for this equation (x-1/x=? ) will be...
Step-by-step explanation:
 
        
             
        
        
        
Slope=change in y/change in x (y2-y1/x2-x1)
Slope=-2-(-5)/3-0=3/3=1
answer: slope=1
 
        
                    
             
        
        
        
Answer:
The parenthesis means to multiply the numbers. I don't understand any of these either but I hope this helps. 
Step-by-step explanation:
 
        
             
        
        
        
Answer:
x = 9
y = 3
Step-by-step explanation:
2x + 2y = 24 is the same as x + y = 12
using substitution, x = 12-y
12 - y = 3y
12 = 4y
y = 3
x = 3(3)
x = 9
 
        
             
        
        
        
We are given that there are a total of 78 students. If we set the following variables:

Then, the sum of all of these must be 78, that is:

Since there are 15 in chemistry and physics and 47 in chemistry, we may replace that into the equation and we get:

Simplifying:

Now we solve for P by subtracting 62 on both sides:

Therefore, there are 16 students in physics