In looking at it I would guess it is asking which of the points is on the line? To answer that you would have to take each point an plug it into the equation and see if it is true.
3x - 7 = y
A(9,20)  
3(9) - 7 = 20
27 - 7 = 20
20 = 20 True - this point is on the line
B(5,0)
3(5) - 7 = 0
15 - 7 = 0
8 = 0 False - this point is not on the line
C(3,2)
3(3) - 7 = 2
9 - 7 = 2
2 = 2  True - this point is on the line
I hope this helps
        
             
        
        
        
Answer is 47.25 
BRAINLIST?
        
             
        
        
        
Answer: The answer to a system of equations is the point(s) of intersection of the equation involved. 
When you have more than one equation with more than one variable, you have a system of equation. The solution(s) is the set of values for each variable that satisfy the equations. This means that the inputting values make the equations true.
        
             
        
        
        
They both would need to get two toppings to cost the same amount which would be $8.60