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11-31.
  1. Solve the following systems of equations and describe the shapes of the intersections. Homework Help ✎

    1. z2 = x2 + y2
      z = x + 2

    2. z2 = x2 + y2
      z = 7

Substitute the second equation for z in the first, and simplify to find an equation of x and y.

What kind of graph is this?

See part (a).