Book Maths Puzzle Algebra

Hello...I'm having trouble with this:

y^2+11y+10=0
Please help.

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Book Other Question

what would the y cordinate be if you graphed these systems of equations?/

3x-y=8
x+2y=-2 A new car valued at $16,500 depreciates at a steady rate of 12% per year. what is the value of the car in 10 years?

How does this convert algebraically?