2. For the function at, 3;) = :52 +y2 + 15 nd the equation of the vertical traces in the wrdirection (so, keeping y constant) and describe the type of curve. Sketch the traces for y = 4, y = 2, y = 0, y = 2, and y = 4 in the :L'zrplmle to check your work. You can use Wolfram alpha. or Geogebra= if you prefer