Question

01. Determine o ângulo formado pelas retas:
r: 2x - y + 1 = 0 es: 3x + y - 2 = 0​

Answer 1

r: 2x - y + 1 = 0 => a=2

s: 3x + y - 2 = 0 => m=-3

tgx = m-a/1+m.a

tgx = -3-2/1+(-3).2

tgx = -5/-5

tgx = 1 ====> x= 45° ✓