Line l has a slope of the line through which of the following pair of points is perpendicular to l? A. (8,2), (2, 4)
B. (4,6), (2,2)
C. (6,2), (2,4)
D. (8,8), (2, 4)

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0