pomoże ktoś rozwiązać te 4 przykłady? pilne na dziś!!!


2x+3y=-19. x+y=8
5x-y=-5 x-3y=16​


Odpowiedź :

1.

2x+3y = -19

x+y = 8

2x+3y = -19

x = 8-y

2(8-y)+3y = -19

x = 8-y

16 - 2y + 3y = -19

x = 8-y

y = -35

x = 8 -(-35)

y = -35

x = 43

2.

5x-y=-5

x-3y=16​

5x-y=-5

x = 16 + 3y

5(16 + 3y)-y=-5

x = 16 + 3y

80 + 15y - y = -5

x = 16 + 3y

14y = -85

x = 16 + 3y

y = -85/14

x = 16 + 3(-85/14)

y = -6 i 1/14

x = 16 - 255/14

y = -6 i 1/14

x = 16 - 18 i i 3/14

y = -6 i 1/14

x = -2 i 3/14