Question

DAU COROANA!ESTE URGENT!EXERCITIUL 3 cu sistemul!

Answer 1

Răspuns:

-2x+3y=11

7x+y= -4 l×(-3)

-2x+3y=11

-21x-3y=12

-23× / =23

x=23/-23

x= -1

-2x +3y=11 si inlocuim pe x cu -1

-2×(-1)+3y=11

2 +3y=11

3y=11-2

3y=9

y=9÷3

y=3

Answer 2

Răspuns:

-2x+3y=11

7x+y=-4

-2x+3y=11

y=-4-7x

-2x+3(-4-7x)=11

y=-4-7x

-2x-12-21x=11

y=-4-7x

-23x=11+12

y=-4-7x

x=23/(-23)

y=-4-7x

x=-1

y=-4-7×(-1)

x=-1

y=3