exam Maths Puzzle Numerical Ability

Hi,
Can you help me with this math problem?Thanks.

Matrices
5. Solve the system of equations corresponding to the given matrix equation.

[5x+y] = [-38]
x+5y -4

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exam Other Question

Make u as the subject in 1/u+ 1/v = 1/f Solve for x:
2logbase4(2x)-logbase4(3x-5)=logbase3 (9)???