exam Maths Puzzle Numerical Ability

(x + 1)(x + 1)

this one is the last homework problem question...thank again!

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x-y=-5
x=3y=3 couldyou please help me understand how to solve this problem?
A piece of property valued at $25000 six years ago is now valued at $18000.What was the annual rate depreciation in the value of the property to the nearest percent?