Question

como posso resolver?

Answer 1

$\left \{ {{4x+5y=-3} \atop {3x+2y=-4}} \right.$

$4x+5y= -3 (-2)$

$3x+2y= -4 (5)$

-----------------------

$-8x-10y=+6$

$15x+10y=-20$

--------------------------

$-8x+15x=+6-20$

$7x=-14$

$x=-\frac{14}{7} =-2$

---------------------

$4x+5y=-3$

$4(-2)+5y=-3$

$-8+5y=-3$

$5y=-3+8$

$y=\frac{5}{5} =1$

x=-2 e y=1