standard_description: (+)Derive the equations of ellipses and hyperbolas given the foci, using the fact that the sum or difference of distances from the foci is constant.
problem_activity: Task
For each set of numbers below, pick two numbers that add to make six. Write an equation that shows that those two numbers add to make 6.
3,    5,     3
6,     0,     2
1,     6,     5
3,     2,     4
4,     2,     6


aligns: no