Simple algebra!

Algebra Level 1

{x+y=153yx=5 \begin{cases} \begin{array}{rcr} x + y &=& 15 \\ 3y - x &=& 5 \end{array} \end{cases}

If xx and yy satisfy the system of equations above, what is the value of x2+2y+1? x^2 + 2y + 1?

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