#10: Write the slope-int. form of the eq'n thru (-2,-3) and (-2,-1).
change in y -1 - (-3) 2
First, find the slope. m = ----------------- = -------------- = -----------
change in x -2 - (-2) 0
We can NOT divide by zero, so the slope here is undefined. That means that the graph of the line thru these 2 points is a VERTICAL one with no y-intercept.
Since both points are on the line whose x-coordinate is -2, that's the equation of the line:
x = -2.