Hi

finding the variation constant and an equation of variation when 'y varies directly as x' 

and y = 70 when x = 7 

  y = kx

 70 = k*7

 10 = k, the variation constant  

  y = 10x, the equation of variation 

Answer by shree840(260)   (Show Source): You can put this solution on YOUR website!
 You have two types of variation direct and indirect

direct variation y=kx  y moves with a multiple of x

In your case y=70 x=7 so 70=k*7  or k=10  so if x=8 y-10*8 

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