Question

{3p-t=10
{-p+2t=-5
pra hj urgente

Answer 1

{-t=10-3p
{-p+2t= -5
-p+2.(10-3p)=-5
-p+20-6p=-5
-7p=-5-20
-7p=-25.(-1)
7p=25
p=25/7
Substituindo:
{-t=10-3p
-t=10-3.(25/7)
-t=10-75/7
-7t/7=70/7-75/7
-7t=70-75
-7t=-5.(-1)
7t=5
t=5/7
Resposta: p=25/7 e t=5/7