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6x + 2y = -20
-2x - 2y = 4
6x + 2y = -20
(znak dodawania równań )
4x = -16 /:4
x = -4
-24 + 2y = -20
2y = 4 / : 2
y = 2
x = -4
Pozdrawiam.
2(3x+y)=-20
x=-y-2
6x+2y=-20
6(-y-2)+2y=-20
-6y-12+2y=-20
-4y=-20+12
-4y=-8
y=8:4
y=2
x=-2-2=-4
odp. x=2
y=-4