exam Maths Puzzle Numerical Ability

solve the system of linear equations
What is x?
5x+2y= -7
What is y?
x+3y=9

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exam Other Question

This questions is a logarithm it is
2/3 (lnx^2-9)-ln(x-3))+ln(x+y)

The answer that I came up with is x=3? The speed of an airplane in still air is 214mph. The plane travels 819mi against the wind and 1505 mi with the wind in a total time of 12 hrs. what is the speed of the wind?