D. Solve each system of equations and confirm that the solution is the same for both systems. E. Shows that the solution lies on the line x+y=2.5.
F. shows thats 6x+3y=9 can be expressed as the sum of 4x+y=4 and x+y=2.5.

A B And C is in the picture

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Step-by-step explanation:fnknnrkle

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.