Question

помогите плизз!!! срочно

Answer 1

$left { {{4x-7y=-12} atop {-4x+3y=12}} right.$
$left { {{x=-3+ frac{7}{4}y } atop {-4x+3y=12}} right.$
$-4(-3+ frac{7}{4}y )+3y=12$
$y=0$
$-4x+3*0=12$
$x=-3$
$left { {{4*(-3)-7*0=-12} atop {-4*(-3)+3*0=12}} right.$
$left { {{-12=-12} atop {12=12}} right.$
$(x, y) = (-3, 0)$

Answer 2

спасибо