Question

I would like to ask for Some help on this equation please?

Answer 1

ABC is a right triangle

AB is perpendicular to BC

If 2 lines are perpendicular, the product of slopes is -1

m1 x m2 = -1

mAB x mBC = -1

mAB = -1 / mBC

mAB = -1 / (1/2)

mAB = -2