How far along do I have to go drop off a - c when I have slope -2b?

斜率-2b的线还要经过哪个横坐标呢

耶鲁公开课 - 博弈论课程节选

On the one hand, Telluride is a very affluent town with high real estate prices, on par with places like Aspen and Deer Valley, and as a result it has all the support industry, like dining, spas, services, and off slope activities like heli-skiing and dog sledding.

FORBES: Telluride - My New Favorite Ski Resort?

In a big blow for Royal Dutch Shell, the Obama administration has blocked the drilling of exploratory wells in the Arctic Ocean off the North Slope of Alaska until 2011 at the earliest.

FORBES: Obama Ban Keeps Alaska Oil Off Limits For Shell

He was fortunate that two of the people who trained him in his apprenticeship were interested in sport and consequently turned a blind eye so that football became something he could "slope off" to train in the afternoon.

BBC: Dougan - the reluctant apprentice