It depends on whether or not you have written the question correctly. If the 2 is an exponent, it needs to be preceded by a ^. Otherwise, it is considered a multiplier. 
x^2 = x²
x2 = x⋅2
y = x²-1 is nonlinear and nonproportional.
        
             
        
        
        
Answer:

Step-by-step explanation:
Slope-intercept form is y-mx+b. To find slope-intercept form solve for y. 
First, subtract 4x from both sides,
3y=-4x+9
Then, divide both sides by 3,
y=-4/3x+3
 
        
                    
             
        
        
        
Answer:
120
Step-by-step explanation:Do you hundred times 40% equals 80. 200-80 = 120 which is the number of girls that attended.
 
        
             
        
        
        
You need to see which is more
        
             
        
        
        
Answer:
 This ans is easily solved by using algebraic identities a²- b² = (a+b) (a-b)
Step-by-step explanation:
1. convert into Identity 
2. solve quadratic equation that formed.