Question

Rezolvati prin metoda reduceri:
1) 5x+3y=-35
15x-7y=-25

2) 8√3x+9√5y=21
4√3x-3√5y=-27
E urgentt va rog

Answer 1

Răspuns:

1.

-15x-9y=105

15x-7y=-25

__________+

/ -16y = 80 =>y=(-5)

35x+21y=-245

45x-21y=-75

___________+

80x / = -320 =>x=(-4)

2.

8xrad3 + 9yrad5 = 21

-8xrad3 + 6yrad5 = 54

__________________+

/ 15yrad5 = 75 =>y=75/15rad5=5/rad5=5rad5/5 =>y=rad5

8xrad3 + 9yrad5 = 21

12xrad3 - 9yrad5 = -81

__________________+

20xrad3 / = -60 =>x=(-60/20rad3)=(-3/rad3)=(-3rad3/3) =>x=(-rad3)