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

graph the two lines y1=3*-5 and y2=-7x+4on the same graph. use algebra to find the coordinates of their point of intersection to 3 decimal places If the product 3/2.4/3.5/4.6/5....a/b = 9. what is the sum of a and b?