Rozwiąż uklad równań:
a) x=2y=5 c) 3x+y=13 e) x-2y = -10
3x-y=1 2x-y=7 1/2y-2=3
b) 2x+y=7 d)x+y = 4
3x-2y=0 x+2y =6
daje najjj :d tylko szybko odpowiedzcie bo mam to na jutro :p :(
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a)x=5-2y 3(5-2y)-y=1,x=5-2y 15-6y-y=1,x=5-2y -7y=1-15/-7,x=5-2y y=2,x=5-2*2 y=2,x=1 y=2 b)y=7-2x 3x-2(7-2x)=0,y=7-2x 3x-14-4x=0,y=7-2x -x=-14/-1,y=7-14 x=14,y=-7 x=14 c)y=13-3x 2x-13-3x=7,y=13-3x -x=-20/-1,y=13-3*20 x=20,y=-47 x=20 d)x=4-y 4-y+2y=6,x=4-y y=6-4,x=4-2 y=2,x=2 y=2 e)x-2y=-10 1/2y=3+2/1/2,x-2y=-10 y=10,x=-10+2*10 y=10,x=10 y=10