There are 400 students at a football game. Each row of bleachers can seat 24 students. How many rows of bleachers are needed to seat all the students?

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step-by-step explanation:

both equations and proportions are better.

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.

a reflection across the x axis and a 90 degree rotation left and right.