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Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

If two parallel lines are cut by a transversal, interior angles on the same side of the transversal are supplementary. a. always b. sometimes c. never

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?