The sqrt(7) part makes it irrational, so the answer is irrational.
 
        
                    
             
        
        
        
Without values for the other variables, I assume you're asking for a literal equation.
12y+d=-19y+t
31y+d=t
31y=-d+t
y=(-d+t)/31
        
                    
             
        
        
        
Answer: 
X=3
Step-by-step explanation: 
Subtract 3 from both sides
Simplify 27-3 to 24
Divide both sides by 8 
Simplify 24/8 to 3 
 
        
                    
             
        
        
        
Answer:
Increasing
−5<x<−1
−1<x<1
Decreasing
4<x<7
−8<x<−5
Neither Increasing nor Decreasing
1<x<4
Step-by-step explanation: