Rozwiąż układ równań metoda przeciwnych współczynników
2x - y = 8
x + 2y = -1
2x - y = - 10
2x - 3y = -18
x + 2y = - 8
-5x - 2y = -12
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a:
2x - y = 8
x + 2y = -1 | * (-2)
2x - y = 8
-2x - 4y = 2
-5y = 10 | : (-5)
y= -2
2x-y=8 | *2
x+2y=-1
4x-2y=16
x+2y=-1
5x=15 | :5
x = 3
x=3
y=2
2x - y =8
x + 2y= -1
4x - 2y = 16
+ x + 2y =-1
5x = 15
x=3
2x - y=8
2 * 5 - 2y = 16
-2y = 6
y=-3
2x-y=-10
2x-3y=-18
-6x + 3y= 30
+ 2x-3y=-18
-4x= 12
x=-3
2x-y=-10
2*(-3) -y=-10
-y=-4
y=4
x + 2y = - 8
+ -5x - 2y = -12
-4x = -20
x=5
x+2y=-8
5+2y=-8
2y=-13
y=-6,5