exam Maths Puzzle Numerical Ability

Solve the system of equations:
9^(3x-y)=(1/81)^-1
(sqrt5)^(2x-y)=1

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exam Other Question

Solve the proportions:

3/2x = 5/x+1

8/t+3 = 1/t

7x/x+1 = 5x/2 Divide: 2x^4-3x^3+x+1 / 2x^2+x+1. I can't seem to understand this one.