Question

Triangle ABC has vertices A(0, -1), B(6, 5), and C(-4, 3). Which statement about triangle ABC is true?

Answer 1

m(AB) = (5 - (-1))/(6 - 0) = 6/6 = 1

m(BC) = (3 - 5)/(-4 - 6) = -2/-10 = 1/5

m(AC) = (3 - (-1))/(-4 - 0) = 4/-4 = -1

Since two of the sides have slopes that are negative reciprocals, it is a right triangle.