Question

{x=7y=3
5x-2y=22 metoda substitutiei pls

Answer 1

{x+7y = 3

{ 5x-2y=22

x+7y=3 => x=3-7y

5x-2y=22 =>

5*(3-7y) - 2y=22 =>15-35y-2y=22

15-37y=22 =>37y=15-22 =>37y= - 7

y=-7/37

x=3-7y =>3-7*(-7/37) + 3+49/37 = >

x= 160/37

{x=160/37

{ y=-7/37