Question

4 x + 3 (y - 7) = -10
-2x - y = 3

Answer 1

Olá,

Vamos lá,

4 x + 3 (y - 7) = -10  ......4x+3y -21=-10......4x+3y=-10+21..4x+3y=11

4x+3y=11
-2x - y = 3

-2x - y = 3
-y = 3 + 2x  *(-1)
y= -3 -2x


4x+3y=11
4x+3(-3-2x)=11
4x-9-6x=11
-2x=11+9  *(-1)
2x=-20
x=-20/2
x= -10

acharemos agora y:
y= -3 -2x
y=-3- 2(-10)
y= -3 + 20
y= 17

Resposta: x=-10 e y = 17