What is the equation of the quadratic graph with a focus of (4,0) and a directrix of y=10?

What is the equation of the quadratic graph with a focus of (4,0) and

1.	What is the equation of the quadratic graph with a focus of (4,0) and a directrix of y=10?
Answer» What is the equation of the quadratic graph with a focus of (4,0) and a directrix of y=10? Solution: