Question

{X-3y=5
{2X+4y=0

Encontrar as 2 incógnitas COM CÁLCULO

Answer 1

{X-3y=5 =====> x=5+3y

{2X+4y=0

2(5+3y)+4y=0

10+6y +4y= 0

10+10y=0

10y= -10

y = -10/10

y = -1 ✓ =====> x=5+3(-1)=5-3= 2 ✓

real:
{X-3y=5 => 2-3(-1)= 2+3=5
{2X+4y=0 => 2(2)+4(-1)=4-4=0