Question 271842
I have to write slope-intercept equation for the line through the given points: 
(-1,-2) and (-1,2)
When I use the slope formula to find the slope I get 4/0 which is undefined. What would my equation be then?

You are correct. The slope is not defined. In this case the line is a vertical line passing through the x-axis at (-1,0). The equation for this line is

x = -1