Answer:
Top right. 
Step-by-step explanation:
So we want a line with a slope of 3 and passes through (2,5). 
To do so, we can use the point-slope form. 
The point-slope form is: 

m is the slope and x₁ and y₁ is an ordered pair. 
Thus, let m be 3, y₁ be 5, and x₁ be 2. Thus: 

Our answer is the top right :)
 
        
                    
             
        
        
        
An infinite number of solutions means a coincident line...it is the same line
3y = 2x - 9...divide by 3
y = 2/3x - 3...hmm...same line as answer choice b....they are coincident lines and have infinite solutions
        
                    
             
        
        
        
Do you mean something like y<21?
        
             
        
        
        
Answer:
C
Step-by-step explanation:
to evaluate substitute x = 0 and x = 1 into f(x)
note that  = 1
 = 1
f(0) = 45 ×  = 45 × 1 = 45
 = 45 × 1 = 45
f(1) = 45 ×  = 45 ×
 = 45 ×  = 15
 = 15