(X + 4) + ( x + 4 ) + x + x
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Yes, these both are direct relationships and can be written like 
, where k is the constant of variation.
For the first equation, k = 10. For the second equation, k = -4/3. You find it by rearranging the equation into the form
, and you use the coefficient of x for k.
For the first equation, k = 10. For the second equation, k = -4/3. You find it by rearranging the equation into the form