Question

Am nevoie de ajutor la asta, dau coroana la primul răspuns corect!​

Answer 1

a) 3x+y=8

X=1-2y

3(1-2y)+y=8

X=1-2y

3-6y+y=8

X=1-2y

-5y=5

X=1-2y

Y=-1

X=1+2=3

b)3(x+2)+4y=-1

2x-4(y+2)=-6

3x+6+4y=-1

2x-4y-8=-6

3x+4y=-7

2x-4y=2

Le scadem:

X=-9

=>y=-5

c)x+y-9/x-2y=3/4

X+y/4-(3x-2y-6/6)=5/4

(x+y-9)*4=(x-2y)*4

3x+3y/12-(6y-4y-12/6)=15/12

4x+4y-36=4x-8y

3x+3y-6y+4y+12=15

4x-4x+8y+4y=36

3x+y=3

12y=36

3x+y=3

Y=3

3x+3=3

Y=3

X=0