exam Maths Puzzle Numerical Ability

Can you please help?
The directions are write the equation of a hyperbola with the given characteristics.

1. vertices (1,-3) and (-7,-3) ; foci (2,-3) and (-8,-3)
2. vertice

Read Solution (Total 0)

exam Other Question

With only the small valve open, all of the liquid can be drained from a large vat in 4 hours. With only the large valve open, all of the liquid can be drained from the same vat in 2 hours. How long would it take to drain the vat with both valves open? Write an equation of a line through the given points.

(4,3) (-2,1)

In know the answer being, y=1/3x+1 2/3... It says the answer in the back of the book. Now could someone explain how to come upon this answer??