Question

Sa se rezolve sistemele:
x+7y=3
3x-2y=32

Answer 1

$\left \{ {{x+7y=3} \atop {3x-2y=32}} \right.$
pe prima o inmultim cu 3 
$\left \{ {{3x+21y=9} \atop {3x-2y=32}} \right.$
$Scadem~cele~2 ~ ecuatii ~ si~avem:$
$21y-(-2y)=9-32$
$23y=-23=\ \textgreater \ \boxed{y=-1}$
$x-7=3=\ \textgreater \ \boxed{x= 10}$