Odpowiedzi

2010-01-18T23:50:11+01:00
B) x-y/3 -x+y/7=0 /x21
2x-5y/5+x-2y/3= 1/3 /x15

21x-7y-21x+3y=0
30x-15y+15x -10y=5

-4y=0
45x-25y=5

y=0
45x=5

y=0
x=9




c) x+y/2+2x+y/3=4 /x6
2x-y/4-x+y/6= -1/6 /x12

x+3y+12x+2y=24
24x-3y-12x+2y=-2

13x+5y=24
12x-y=-2 /x5

13x+5y=24
60x-5y=-10

+/

73x=14/:73
x=5.21

y=?
13x+5y=24
13x5.21-24=-5y
-5y=43,73/ :(-5)
y=8 i 3/4

x=5.21
y=8.75







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