Yesh plesse help me eith this im dyinggg

you are saying it as if a fact, not a question, but yes, you would be correct? ; )

step-by-step explanation:

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.