Find the greatest common factor of 12m^2 and 9b^4

The greatest common factor of 12m^2 and 9b^4 is 3.

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Since the variation is direct, then we have an equation of the form:
 
 From here, we must find the value of k.
 For this, we use the following data:
 y = 245 when x = 7
 Substituting values we have:
 
 Rewriting we have:
 
 Clearing k we have:
 
 
 Therefore, the equation is given by:
 
 Evaluating the equation for x = 9 we have:
 
 Answer
 The value of y when x = 9 is: