Lisa lives in atlanta. she is going to a baseball game with her two sisters and her parents. they have $100 to spend. after they buy their tickets, how much money will they have left to buy refreshments?

2nd one in the first row is correct

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.