Question

Equações do 1° Grau.x-2y=3 x+4y=9

Answer 1

X-2y(2)=3(2)
X+4y=9

3x=15
3x/3=15/3
X=5
5-2y=3
Y=1

Y=1
X=5

Answer 2

Resposta:

x-2y=3

x+4y=9

x-2y=3 (2)

x+4y=9

x-4y=3

x+4y=9

2x-0=12

2x=12+0

2x= 12

x= 12÷2

x=6

6+4y=9

4y=9-6

4y=-3

y=3/4