Question

(A)
{2x-3y=5
{x+y= 0

(B)
{2x+y=1
{2x+y=9

Answer 1

B)-

4x = 10
x = 2.5

2x + y = 1
2× 2.5 + y = 1
5 + y = 1
y = 1-5
y=-4

CONJUNTO SOLUÇÃO =

X=2.5
Y= -4

Answer 2

(A)
{ 2x-3y= 5 .(-1)
{ x+y= 0 .(2)

-2x + 3y = -5
2x + 2x = 0
(cancela o -2x com 2x)
5y = -5
y = -1
substitui e fica x = 1