exam Maths Puzzle Numerical Ability

Make u as the subject in 1/u+ 1/v = 1/f

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exam Other Question

Solve the system by graphing.

x - 2y = 8
x + y = -1 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