Answer:
C=14
Step-by-step explanation:
To find the minimum value, graph each of the inequalities. After graphing each inequality, test a point and shade the region that satisfies the inequality. Once all inequalities have been shaded, find the region where they all overlap. The region will be bounded by intersection points. Test each of these points into C=x+3y. The least value for C is the minimum.
(14,0)                  (0,17.5)                   (3.08,3.64)
C=14+3(0)           C=0+3(17.5)           C=3.08 + 3(3.64)
C=14                   C=52.5                   C=14
 
        
                    
             
        
        
        
Let's consider the equation; 
7x+2=y <-- no denominator present
If you look at the graph, you will also notice that there are no possible values of x that cannot be represented through this graph. There will always be a corresponding y coordinate. 
This can be applied to a wide range of equations where no denominator with an x value will have a vertical asymptote. Try to visualize a simpler situation with the same qualities if you don't know how to find the solution. 
Hope I helped :) 
        
             
        
        
        
Step-by-step explanation:
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Ummm if its multiply then its 1 and 6. is its addition then its 1 and 5 or 6 and 0. if its divide it would be 6 and 1. is its subtraction then it would be 7 and 1 or 6 and 0