Final answer:
The point-slope form equations for the given slopes and points are presented, demonstrating the application of the slope and a specific point on the line. For the vertical line case, the reason behind the impossibility of representing it in the traditional point-slope form, due to an undefined slope, is explained.
Step-by-step explanation:
1.) The point-slope form of the equation of the line with a slope of -2 and an x-intercept of -1 can be written as y - 0 = -2(x - (-1)) or y = -2(x + 1). Since the line intercepts the x-axis at (-1,0), we can use this point and the slope to write the equation.
2.) For a line passing through (1, 3) with a slope of 2, the point-slope form is given by y - 3 = 2(x - 1).
3.) For a line passing through (-1, 5) with a slope of -1, we use the same format to write the equation as y - 5 = -1(x - (-1)) or y - 5 = -1(x + 1).
4.) A horizontal line passing through (2, 1) has a slope of 0, thus the point-slope form is simply y = 1, since the y-value remains constant.
5.) It is not possible to write the equation of a line passing through (-6, 6) and (-6, 2) in the traditional point-slope form because this line is vertical and the slope is undefined. The x-value remains constant at -6, indicating that there is no run, only a rise or fall, which is why the slope calculation (rise/run) would result in division by zero.