Question

5. As retas r: 2x +3y - 1 = 0 e s: 3x + ky - 5 = 0, são perpendiculares. O valor de k é:
a) 0
b) - 2
d) 3
e) 2.
c) - 3​

Answer 1

Ar . As + Br . Bs = 0

(2.3) + (3.k) = 0

3k + 6 = 0

k = -6/3

k = -2