Use the point slope formula to write an equation of the line that passes through (4/7, -7/5) and has an undefined slope

Answer 1

If the slope is undefined, you cannot write the equation in point slope form. (Where did this question come from?) Undefined slope means the line is vertical, which is a line of constant x. Since the line passes through (4/7,-7/5), its equation must be

x = 4/7