On Saturday, grace baby sat for x hours and was paid nine dollars per hour. Willow baby set for Y hours and was paid eight dollars per hour. Which of the following expressions represents the total that they were paid together

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.