Question

{x-y=2
2x-3y=2 rezolvati in multimea numerelor reale prin metoda substitutiei sistemului de ecuatii

Answer 1

$\left \{ {{x-y=2} \atop {2x-3y=2}} \right.$
$\left \{ {{x=2+y} \atop {2(2+y)-3y=2}} \right.$
$\left \{ {{x=2+y} \atop {-y=-2}} \right.$
$\left \{ {{x=2+y} \atop {y=2}} \right.$
$\left \{ {{x=4} \atop {y=2}} \right.$
S={(2;4)}