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

There were only two candidates who participated in an election. One contestant got 62% votes and was elected by a margin of 144 votes. The total number of votes were: can someone PLEASE help me solve this system:
{ x+ y-4z=6
{2x-5y+3z=2
{ x-6y+7z=-4
thank you so much!