To find the equation of the line passing through the given points (9, 7) and (9, 1), we need to first determine the slope of the line. Since the x-coordinate of both points is the same, the line is a vertical line, and its slope is undefined.
Therefore, the point-slope form of the equation of the line is:
x = 9
To write this equation in slope-intercept form, we need to solve for y:
y = mx + b
Since the slope is undefined, there is no y-intercept, and we cannot write the equation in slope-intercept form