Answer to Question 3

 

3.   x2 + y2 = 16
  y = -4		  
Start with quadratic equation. x2 + y2 = 16
This is the equation of a circle. Center = (0,0)
Radius = 4
Graph the circle.
Now graph the line.  This is a special line.  It contains all the points whose y-coordinates are -4.

x2 + y2 = 16
y = -4
Find the points of intersection.  In this example there is only one.

Solution Set:
{(0,-4)}

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