What is the equation of the line that passes through the point (7,-3)(7,−3) and has an undefined slope?
since the two points are the same, ax+by = 7a-3b
for any choice of a and b
To find the equation of a line that passes through a given point and has an undefined slope (i.e., a vertical line), we know that the equation must be in the form x = k, where k is the x-coordinate of the point the line passes through.
In this case, the line passes through the point (7, -3), so the equation of the line is x = 7.