Question

8) As retas 4x + 6y - 5 = 0 e 14x + 30y - 1 = 0, tem ponto de intersecção:

Answer 1

Resposta:

4x + 6y - 5 = 0  ==>vezes 5 ==>20x+30y-25=0 (i)

14x + 30y - 1 =0 (ii)

(i)-(ii)

20x-14x+30y-20y-25-(-1)=0

6x-24=0

6x=24

x=4

Usando (ii) ==> 14*4+30y-1=0

30y=1-14*4

30y=-55

y=-55/30=-11/6

Ponto ==> (4 , -11/6)