exam Maths Puzzle Numerical Ability

what are the steps to solving the equation? do i use logarithmics?

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exam Other Question

one number is 4 less than 3 times a second number. If 3 more than twice the first number is decreased by the second, the result is 11. Find both numbers

please help me i need this tonight! Which equation best models the data:
x:-2,0,2,4
y: 3.5,7,14,28
a) y=3.5(2)^(x/2)
b) y=3.5(2)^x
c) y=7(2)^(x/2) or
d) y=7(2)^x ????