Question

X=2y-1
2x+3y=12 va rog dau inima

Answer 1

2(2y-1) +3y=12
4y-2+3y=12
7y-2=12
7y=12+2=14
y=14/7=2
x= 2*2-1 = 4-1=3

Answer 2

Răspuns:

x=3,y=2

Explicație pas cu pas:

Dacă x=2y-1=>2x=2(2y-1) deci 2x=4y-2.Inlocuim:

2x+3y=4y-2+3y=12, 4y+3y=14 deci 7y=14.

7y=14=>y=14/7=2 deci y=2.

X=2y-1=>x=2*2-1=3 deci x=3.