Question

What is the slope of the line that has a y-intercept of -1?

Answer 1

to get the slope of any straight line, we simply need two points off of it, let's use the ones in the picture below.

`(\stackrel{x_1}{1}~,~\stackrel{y_1}{1})\qquad (\stackrel{x_2}{2}~,~\stackrel{y_2}{3}) ~\hfill \stackrel{slope}{m}\implies \cfrac{\stackrel{rise} {\stackrel{y_2}{3}-\stackrel{y1}{1}}}{\underset{run} {\underset{x_2}{2}-\underset{x_1}{1}}} \implies \cfrac{2}{1}\implies \text{\LARGE 2}`