Question

3x+2y=18 2x+2y=14 x=?
b te rog

Answer 1

a) x +2y=24 si x+y=19⇒x=19-y

atunci vom inlocui in prima euatie pe x = 19-y

19-y+2y=24 ⇒2y-y=24-19⇒y=5

x=19-y⇒x=19-5⇒x=14

verificare

14+ 2x5=14+10=24

b) 3x+2y=18  si 2x+2y=14⇒2y=14-2x

3x+14-2x=18

x=18-14

x=4