exam Maths Puzzle Numerical Ability

Goodmorning ,
I really need help on this problem .
i had submitted earlier but with no response .
please HELP !!
THANKS IN ADVANCE

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exam Other Question

6x+y=12 Find the difference quutient :

f(x + h) - f(x)
_________________ (h does not equal 0)
h

f(x) = 2 + 4x