Fifty points to the insomniac out there who recognizes and solves this equation:  

[latex]V_{esc} = \sqrt{\frac{2GM}{R}}[/latex]

$$y=3x+2$$

It's an easy one ;)

(note: for the Earth, M = 5.97219 × 1024 and R = 6,371km You have to figure out the rest!)