Which equation would help determine the cost of
13 markers?

add a pic of the graph, then ill edit this "answer" and solve it for you : 3

step-by-step explanation:

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.

333.74 ! should be your answer for this question