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)
