exam Maths Puzzle Numerical Ability

Solve the system of linera equations by the substitution method.
y = -4/3 x
4x + 2y = 3/4

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exam Other Question

Please kindly help me with these questions. How can I perform the indicated operation or solve the equation, whichever is appropriate.

1. x^2-4/x / 4x-8/x

2. 4/a^2-1 + 1/2a The difference of two numbers is 91. The second is 5 less than 5 times the first. What are the two numbers.