Question

5-4y=9
3x+2y=1
Rezolvati prin metoda substitutiei.Help!!

Answer 1

$\left \{ {{-4y=4} \atop {3x=1-2y}} \right.$⇔$\left \{ {{y=-1} \atop {x= \frac{1-2y}{3} }} \right.$⇔$\left \{ {{y=-1} \atop {x= \frac{1+2}{3} }} \right.$⇔$\left \{ {{y=-1} \atop {x=1}} \right.$

Answer 2

din prima ecuatie scoatem x => 5x=9+4y =>x=(9+4y)/5 . acum inlocuim in a doua ecuatie => 3*(9+4y)/5+2y=1, reducem numitorul amplificand pe 2y si pe 1 cu 5 =>27+12y+10y=5 => 22y=5-27 =>22y=-22 =>y=-1 =>x=[9+4*(-1)]/5 =>x=(9-4)5 =>x=5/5 =>x=1